Description of problem:
TL;DR: Have centralised setting for yum/dnf repository option compare_providers_priority (yum) / priority (dnf), for each repo.

User story: a customer wants to prefer installing packages (as dependency ones) from some repositories rather than from others. Say if package abc is available in EPEL and depends on python3-blah library both in EPEL and RHEL, they want the python3-blah package to be installed from RHEL repo due to the priority.

That is achieved by compare_providers_priority (yum) / priority (dnf) repository option (see "man 5 yum.conf") - but that is on client basis, where one has to manually modify /etc/yum.repos.d/redhat.repo for each repo on each system. Manual, error prone.

Due to the repetitive+manual change on each host of supposedly same priorities for the same repo, it is requested to configure this centrally from Satellite.

Version-Release number of selected component (if applicable):
Sat6.9

How reproducible:
100%

Steps to Reproduce:
1. No way to centrally define repo variables compare_providers_priority (yum) / priority (dnf) to /etc/yum.repos.d/redhat.repo .

Actual results:
No such feature.

Expected results:

• a repository object to have configurable option "repo priority", configurable via WebUI or hammer or API, acceptable values are Int from range 1-99.
• (only!) when the value is set, sub-man refresh (or similar operation that modifies redhat.repo file) on a client will set to this repository compare_providers_priority (rhel7) or priority (rhel8+) to this value
• the setting of a root repo will be applied to all its clones in any CV
• unsetting the value for some repo means "sub-man refresh" removes the setting for any (cloned) repo on that client in yum.repos.d/redhat.repo

Additional info: