Fixes #28050 - rpm content upload

[jjeffers]

This PR updates Katello for rpm content uploads. It should now be possible to upload from the web UI or hammer.

For example:

[vagrant@centos7-hammer-devel2 hammer-cli-katello]$ hammer repository upload-content --id 2 --path zebra-0.1-2.noarch.rpm --content-type rpm
[...]
Successfully uploaded file 'zebra-0.1-2.noarch.rpm'

where '2' is the id of an existing (empty) yum repository.

After completing the upload you should observe that the package is listed in the repository.

[vagrant@centos7-hammer-devel2 hammer-cli-katello]$ hammer repository info --id 2
Warning: An error occured while loading module hammer_cli_foreman_remote_execution.
ID:                 2
Name:               VijayTest2
Label:              VijayTest2
Organization:       Default Organization
Red Hat Repository: no
Content Type:       yum
[...]
Content Counts:     
    Packages:       1
    Source RPMS:    0
    Package Groups: 0
    Errata:         0
    Module Streams: 0

[theforeman-bot]

Issues: #28050

[jjeffers]

[test katello]