[redhat-3.7] mirroring: fix mirror claims for multiple processes (PROJQUAY-3982) #1453
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Previous logic for claiming mirror ("locking") relied on the value
returned from updating the database row. Since this was always being
updated with a new expiration time, it would always succeed, even when
another process had already claimed the same mirror.
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This is an automated cherry-pick of #1433
/assign HammerMeetNail