Check for Micro for 6.0 and 6.1

[jesusbv]

Description

As Micro 6.0 and 6.1 have 'SL-Micro' as identifier adjust the check to Micro to keep it working
for SUMA and for bsc#1230419

• Related Issue / Ticket / Trello card:

How to test

Start a PAYG SL-Micro instance for 6.0 or 6.1 , it should register without issues

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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[digitaltom]

Please add this to the changelog

[rjschwei]

@digitaltom this also means we are going to need 2.21 as soon as rmt-2.20 made it through the cycle.