Liberty registration script support for sll7 clients

[zpetrova]

Description

Please describe your change and provide as much context as possible.

Fix for SUSE Liberty registration script to allow RHEL7/SLL7/CentOS7 clients to register to RMT servers

Fixes # (issue)

Change Type

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• [ ] Bug Fix (a non-breaking change which fixes an issue)
• [x] New Feature (a non-breaking change which adds new functionality)
• [ ] Documentation Update (a change which only updates documentation)

Checklist

Please check off each item if the requirement is met.

• [ ] I have verified that my code follows RMT's coding standards with rubocop.
• [x] I have reviewed my own code and believe that it's ready for an external review.
• [x] I have provided comments for any hard-to-understand code.
• [ ] I have documented the MANUAL.md file with any changes to the user experience.
• [ ] RMT's test coverage remains at 100%.
• [x] If my changes are non-trivial, I have added a changelog entry to notify users at package/obs/rmt-server.changes.

Other Notes

Please use this space to provide notes or thoughts to the team, such as tips on how to review/demo your changes.

We've tested the script on SLL,RHEL and CentOS version 7 and SLL, RHEL version 8,9

[digitaltom]

@zpetrova @plorinc does this supersede https://github.com/SUSE/rmt/pull/1075? (that one seems to include some extra scripts) FYI: I've added both of you as collaborators, so you can submit pull requests from branches and don't need to fork. This will enable the RMT feature tests to run on your pull requests.

[digitaltom]

Could this get reviewed by @plorinc? We're lacking the infrastructure/setup for this.

[zpetrova]

Hi Thomas, if I look correctly #1075 adds three files (register.sh,rmt-client-setup-res7, rmt-client-setup7), rmt-client-setup-res supersede them. Lörinc already removed them.

[plorinc]

@digitaltom This supersedes #1075, the latter can be deleted.