Add cache check

[jesusbv]

Description

When a BYOS or HYBRID system activates a product with SCC we check first if the registration code use for that activation is in the cache for that product

If there is a match in the cache and the registration code is active we do not reach to SCC, update the cache and update the system pubcloud_reg_code if reg code is new or different

If there is no match in the cache we call SCC, update the cache and update the system pubcloud_reg_code if it's new or different

If the registration code is inactive, we do not follow with the activation

There is also the registry cache handling logic included

• Related Issue / Ticket / Trello card:

How to test

Trying to activate a product on a BYOS instance within the cache being valid should not reach to SCC
Trying to activate a product on a BYOS instance when the cache expired should reach to SCC

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.
• 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.

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