filter by the whole key

[jesusbv]

Description

When creating or updating a system during regsharing, use the full unique combination

This Fixes bsc#1236600

• Related Issue / Ticket / Trello card: https://bugzilla.suse.com/show_bug.cgi?id=1236600

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[digitaltom]

Looks good in general. But this needs testing, because I could imagine that when the system token rotates on the source RMT, the system would not get found on the target RMT anymore because it has a different system token. How do we handle that case?