Foreman Maintain

Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1591137

Description of problem:
The upgrade of satellite 6.3 is impossible, when yum-cache directory is mounted directly

Version-Release number of selected component (if applicable):
rubygem-foreman_maintain-0.1.5-1.el7sat.noarch

How reproducible:
always

Steps to Reproduce:
1. mount /dev/sdb /var/cache/yum
2. # foreman-maintain upgrade run --target-version 6.3

Actual results:
Running Migration scripts to Satellite 6.3 ================================================================================
Setup repositories: | Configuring repositories for 6.3 [OK]
--------------------------------------------------------------------------------
Update package(s) :
Loaded plugins: enabled_repos_upload, package_upload, product-id, search-disabled-repos, subscription-manager
Cleaning repos: rhel-7-server-rpms rhel-7-server-satellite-6.3-rpms
: rhel-7-server-satellite-maintenance-6-rpms rhel-7-server-satellite-tools-6.3-rpms
: rhel-server-rhscl-7-rpms
Cleaning up everything
Maybe you want: rm rf /var/cache/yum, to also free up space taken by orphaned data from disabled or removed repos
Uploading Enabled Repositories Report
Loaded plugins: product-id, subscription-manager
[FAIL]
Failed executing rm -rf /var/cache/yum, exit status 1:
rm: cannot remove ‘/var/cache/yum’: Device or resource busy
-------------------------------------------------------------------------------
Scenario [Migration scripts to Satellite 6.3] failed.

The following steps ended up in failing state:

[packages-update]

Expected results:
No error

Additional info:

Changing the rb-file workaround this issue

/usr/share/gems/gems/foreman_maintain-0.1.5/lib/foreman_maintain/concerns/system_helpers.rb

...
- 109 execute!('rm -rf /var/cache/yum')
+ 109 execute!('rm -rf /var/cache/yum/*')
...

==> adding '/*' at the end of the command