Workaround for yum v3.4.3 downgrade test

[dhodovsk]

RHEL 7 has yum v3.4.3. As far as I understood, a downgrade on that version is failing to successfully resolve dependencies available in multiple repos by itself, which results in an error, e.g:

Error: Package: freeradius-utils-3.0.13-15.el7.x86_64 (rhel-opt)
           Requires: freeradius = 3.0.13-15.el7
           Installed: freeradius-3.0.13-15.el7_9.1.x86_64 (@brew-62705510)
               freeradius = 3.0.13-15.el7_9.1
           Available: freeradius-3.0.13-15.el7.x86_64 (rhel)
               freeradius = 3.0.13-15.el7

This MR workarounds the issue by adding list of all installed content from the tested task repo to the downgrade command.

[jankaluza]

I'm actually checking that there is no way to fully test it since the test packages are not built for epel7. Have you tried this code manually on rhel-7, or is it just a guess for now?

[dhodovsk]

I debugged and tried the command on centos:7 (before it EOLed) and then again on a random rcm rhel 7 image.

[jpopelka]

I'm fine with this, It can't be worse than the current situation. :-)

[jpopelka]

Can you also bump the Release in the spec file?