Change log:
c6ecd90 Fix IMAP race condition around idle()
d6a4422 (apinske/5.3.x) GH-536: Fix test for backport
dc51a8c GH-3526: Fix Infinite Loop in FailoverCConnFactory
a7843af GH-3521: Delayer: schedule release task with TX (#3525)
d016dd5 GH-3507: Fix Tail producer for proper command
b7d9b87 (gigermocas/5.3.x) GH-3497: ReplyProducerCleaner: check only MPs