CentOS8 client cannot register to rpm

[zpetrova]

symlink, but rpm expected directory.

Description

in centos8 /usr/share/redhat-release is a symlink to centos-release. When register client to rmt, rpm tries to update centos-release.rpm to sll-release.rpm and fails because it cannot convert symlink to directory. Solution is to remove the file before register.

Fixes # (issue)

Change Type

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• [ x] Bug Fix (a non-breaking change which fixes an issue)
• 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.
• [ x] 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

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