Adjust finding the children in utils.blender to new method

[SchoolGuy]

Currently on master the cobbler import is broken because I did not adjust the way children are found in the correct way. This PR is the fix for the current problem.

[nodeg]

I can confirm that the import works again.

$ cobbler import --name=centos83 --arch=x86_64 --path=/mnt2
task started: 2021-06-11_090512_import
task started (id=Media import, time=Fri Jun 11 09:05:12 2021)
running python triggers from /var/lib/cobbler/triggers/task/import/pre/*
running shell triggers from /var/lib/cobbler/triggers/task/import/pre/*
shell triggers finished successfully
import_tree; ['/mnt2', 'centos83', None, None, None]
importing from a network location, running rsync to fetch the files first
mkdir: /srv/www/cobbler/distro_mirror/centos83-x86_64
running: rsync -a  '/mnt2/' /srv/www/cobbler/distro_mirror/centos83-x86_64 --progress

received on stdout: sending incremental file list
received on stderr: 
Found a candidate signature: breed=redhat, version=rhel8
Found a matching signature: breed=redhat, version=rhel8
Adding distros from path /srv/www/cobbler/distro_mirror/centos83-x86_64:
creating new distro: centos83-x86_64
trying symlink: /srv/www/cobbler/distro_mirror/centos83-x86_64 -> /srv/www/cobbler/links/centos83-x86_64
running python triggers from /var/lib/cobbler/triggers/add/distro/pre/*
running shell triggers from /var/lib/cobbler/triggers/add/distro/pre/*
shell triggers finished successfully
mkdir: /srv/www/cobbler/images/centos83-x86_64
trying hardlink /srv/www/cobbler/distro_mirror/centos83-x86_64/images/pxeboot/vmlinuz -> /srv/www/cobbler/images/centos83-x86_64/vmlinuz
trying hardlink /srv/www/cobbler/distro_mirror/centos83-x86_64/images/pxeboot/initrd.img -> /srv/www/cobbler/images/centos83-x86_64/initrd.img
mkdir: /srv/tftpboot/images/centos83-x86_64
trying hardlink /srv/www/cobbler/distro_mirror/centos83-x86_64/images/pxeboot/vmlinuz -> /srv/tftpboot/images/centos83-x86_64/vmlinuz
trying hardlink /srv/www/cobbler/distro_mirror/centos83-x86_64/images/pxeboot/initrd.img -> /srv/tftpboot/images/centos83-x86_64/initrd.img
processing boot_files for distro: centos83-x86_64
skipping symlink, destination (/srv/www/cobbler/links/centos83-x86_64) exists
Writing template files for centos83-x86_64
running python triggers from /var/lib/cobbler/triggers/change/*
running python trigger cobbler.modules.scm_track
running python trigger cobbler.modules.managers.genders
running shell triggers from /var/lib/cobbler/triggers/change/*
shell triggers finished successfully
running python triggers from /var/lib/cobbler/triggers/add/distro/post/*
running shell triggers from /var/lib/cobbler/triggers/add/distro/post/*
shell triggers finished successfully
creating new profile: centos83-x86_64
get_items; ['distro']
done with get_items; ['distro']
get_items; ['distro']
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running python triggers from /var/lib/cobbler/triggers/add/profile/pre/*
running shell triggers from /var/lib/cobbler/triggers/add/profile/pre/*
shell triggers finished successfully
Writing template files for centos83-x86_64
get_items; ['distro']
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get_items; ['distro']
done with get_items; ['distro']
get_items; ['distro']
done with get_items; ['distro']
running python triggers from /var/lib/cobbler/triggers/change/*
running python trigger cobbler.modules.scm_track
running python trigger cobbler.modules.managers.genders
running shell triggers from /var/lib/cobbler/triggers/change/*
shell triggers finished successfully
running python triggers from /var/lib/cobbler/triggers/add/profile/post/*
running shell triggers from /var/lib/cobbler/triggers/add/profile/post/*
shell triggers finished successfully
get_items; ['distro']
done with get_items; ['distro']
get_items; ['distro']
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done with get_items; ['distro']
get_items; ['distro']
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get_items; ['distro']
done with get_items; ['distro']
Added child "centos83-x86_64" to parent "centos83-x86_64"
associating repos
checking for rsync repo(s)
mkdir: /srv/www/cobbler/images/centos83-x86_64
mkdir: /srv/tftpboot/images/centos83-x86_64
find_items; ['']
find_items; ['distro']
find_items; ['']
find_items; ['distro']
processing boot_files for distro: centos83-x86_64
skipping symlink, destination (/srv/www/cobbler/links/centos83-x86_64) exists
Writing template files for centos83-x86_64
find_items; ['']
find_items; ['distro']
find_items; ['']
find_items; ['distro']
Writing template files for centos83-x86_64
get_items; ['distro']
done with get_items; ['distro']
get_items; ['distro']
done with get_items; ['distro']
get_items; ['distro']
done with get_items; ['distro']
Writing template files for centos83-x86_64
get_items; ['distro']
done with get_items; ['distro']
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get_items; ['distro']
done with get_items; ['distro']
checking for rhn repo(s)
mkdir: /srv/www/cobbler/images/centos83-x86_64
mkdir: /srv/tftpboot/images/centos83-x86_64
find_items; ['']
find_items; ['distro']
find_items; ['']
find_items; ['distro']
processing boot_files for distro: centos83-x86_64
skipping symlink, destination (/srv/www/cobbler/links/centos83-x86_64) exists
Writing template files for centos83-x86_64
find_items; ['']
find_items; ['distro']
find_items; ['']
find_items; ['distro']
Writing template files for centos83-x86_64
get_items; ['distro']
done with get_items; ['distro']
get_items; ['distro']
done with get_items; ['distro']
get_items; ['distro']
done with get_items; ['distro']
Writing template files for centos83-x86_64
get_items; ['distro']
done with get_items; ['distro']
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checking for yum repo(s)
starting descent into /srv/www/cobbler/distro_mirror/centos83-x86_64 for centos83-x86_64
processing repo at : /srv/www/cobbler/distro_mirror/centos83-x86_64/AppStream
need to process repo/comps: /srv/www/cobbler/distro_mirror/centos83-x86_64/AppStream
looking for /srv/www/cobbler/distro_mirror/centos83-x86_64/AppStream/repodata/*comps*.xml
Keeping repodata as-is :/srv/www/cobbler/distro_mirror/centos83-x86_64/AppStream/repodata
processing repo at : /srv/www/cobbler/distro_mirror/centos83-x86_64/BaseOS
need to process repo/comps: /srv/www/cobbler/distro_mirror/centos83-x86_64/BaseOS
looking for /srv/www/cobbler/distro_mirror/centos83-x86_64/BaseOS/repodata/*comps*.xml
Keeping repodata as-is :/srv/www/cobbler/distro_mirror/centos83-x86_64/BaseOS/repodata
mkdir: /srv/www/cobbler/images/centos83-x86_64
mkdir: /srv/tftpboot/images/centos83-x86_64
find_items; ['']
find_items; ['distro']
find_items; ['']
find_items; ['distro']
processing boot_files for distro: centos83-x86_64
skipping symlink, destination (/srv/www/cobbler/links/centos83-x86_64) exists
Writing template files for centos83-x86_64
find_items; ['']
find_items; ['distro']
find_items; ['']
find_items; ['distro']
Writing template files for centos83-x86_64
get_items; ['distro']
done with get_items; ['distro']
get_items; ['distro']
done with get_items; ['distro']
get_items; ['distro']
done with get_items; ['distro']
Writing template files for centos83-x86_64
get_items; ['distro']
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*** TASK COMPLETE ***

$ cobbler distro list
   centos83-x86_64
$ cobbler distro report
Name                           : centos83-x86_64
Architecture                   : x86_64
Automatic Installation Template Metadata : {'tree': 'http://@@http_server@@/cblr/links/centos83-x86_64'}
TFTP Boot Files                : {}
Boot loaders                   : ['grub']
Breed                          : redhat
Comment                        : 
Fetchable Files                : {}
Initrd                         : /srv/www/cobbler/distro_mirror/centos83-x86_64/images/pxeboot/initrd.img
Kernel                         : /srv/www/cobbler/distro_mirror/centos83-x86_64/images/pxeboot/vmlinuz
Kernel Options                 : {}
Kernel Options (Post Install)  : {}
Management Classes             : []
OS Version                     : rhel8
Owners                         : []
Redhat Management Key          : 
Remote Boot Initrd             : 
Remote Boot Kernel             : 
Template Files                 : {}

We should definitely get rid of the

get_items; ['distro']
done with get_items; ['distro']

log messages when importing. This is too verbose and very annoying.