Add pubcloud_reg_code to regsharing info

[jesusbv]

Description

Share the pubcloud_reg_code needed to check the cache

• Related Issue / Ticket / Trello card:

How to test

Register a system with a registration code and check the RMT sibling, it should have the same reg code

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

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• I have reviewed my own code and believe that it's ready for an external review.
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• 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.

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