Add ppc64le kernel path (#1374609)

[mkumatag]

https://github.com/CentOS/sig-cloud-instance-build project is using livemedia-creator utility to create image but it is failing due to kernel and initrd files are checked in /isolinux folder. Centos7 ppc64le platform iso contains kernel and initrd under ppc/ppc64 folder, so added code to check in both the folder else fail as usual.

[root@rhel72 docker]# ./containerbuild.sh centos-7ppc64le.ks
2016-08-19 11:58:08,435: disk_size = 3GB
2016-08-19 11:58:08,436: disk_img = /var/tmp/centos-7ppc64le-docker.tar.xz
2016-08-19 11:58:08,436: install_log = /tmp/virt-install.log
mount: /dev/loop2 is write-protected, mounting read-only
ERROR    Host does not support any virtualization options 
Traceback (most recent call last):
  File "/usr/sbin/livemedia-creator", line 1284, in <module>
    disk_img = make_image(opts, ks)
  File "/usr/sbin/livemedia-creator", line 904, in make_image
    virt_install(opts, install_log, disk_img, disk_size)
  File "/usr/sbin/livemedia-creator", line 836, in virt_install
    qcow2=opts.qcow2)
  File "/usr/sbin/livemedia-creator", line 324, in __init__
    raise Exception("Problem starting virtual install")
Exception: Problem starting virtual install

real    0m0.552s
user    0m0.404s
sys 0m0.130s
mv: cannot stat ‘/var/tmp/centos-7ppc64le-docker.tar.xz’: No such file or directory
[root@rhel72 docker]#

[bcl]

pushed