R1:22de618d3bd3

When acquiring a GlobalLock, put good connections that just got unlucky back in the pool

Summary:
See PHI1794, which describes a connection exhaustion issue with a large number of webhook tasks in queue.

The "GlobalLock" mechanism manages a separate connection pool from the main pool, and webhook workers immediately try to grab a webhook lock with a 0-second wait when they start. So far, this is fine.

Prior to this change, good connections which fail to acqiure a lock are discarded. This can lead to…