Check LTSS product to verify

Description

After a non free extension has been activated successfully on a PAYG system, RMT calls ZypperAuth verify_instance method without any other information, the SCC verification of the activation would fail as there is no product info to check against

Adding the product id present in the request params, that way RMT can fetch the product class and verify properly

This Fixes bsc#1230154

Related Issue / Ticket / Trello card: 1230154

How to test

clean up registration of a PAYG system
re-register the instance
register a LTSS extension on that registered PAYG instance (i.e. 15.4) -> should work
remove LTSS extension
register a LTSS extension on that registered PAYG instance -> should work

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

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[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.
[ ] 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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SUSE / rmt