Update cache scrubber

[jesusbv]

Description

Add the new cache directories and their expiration times to the cache scrubber

This is a step in the list of steps to reduce queries to SCC

• Related Issue / Ticket / Trello card:

How to test

with this changes in place, restarting RMT should show the new cache directories in /var/lib/rmt/rmt-cache-trim.sh

Change Type

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• 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 reviewed my own code and believe that it's ready for an external review.
• I have provided comments for any hard-to-understand code.
• I have documented the MANUAL.md file with any changes to the user experience.
• If my changes are non-trivial, I have added a changelog entry to notify users at package/obs/rmt-server.changes.

Review

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[jesusbv]

Please, merge after #1275

[rjschwei]

Duplicates entry from #1275