Defer shutdown until actives sessions are 0 #1108
Open
+172
−88
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This defers shutdown by still processing I/O requests in the existing downstream and session handlers, but blocks downstream loops from creating new sessions, so sessions will stay alive as long as traffic continues, but once they don't have traffic any longer they will eventually be pruned from the pool, and shutdown will continue, also shutting down the phoenix thread if it exists before informing the proxy to exit.
Resolves: #1107