[v4_1_esv] Patch the failover code to avoid deadlocks
Patch for 36810 & 20352 This coves several related problems 1) When the primary is in conflict done it allows the secondary to transition around resolution interrupted and potentical conflict previously the primary would die on an illegal state. 2) It allows the servers to restart a bind update request. Previously if one of the servers sent an udpate request and there died (or had the communications interrupted) in some states the first server wouldn't retransmit a new update request and the other server wouldn't send any bind updates. This was noticed in potential conflict. 3) Updated the state transitions to move the leases on the ack queue back to the update queue in case of conflict-done as we might need to retransmit them all. 4) Updated a transition from startup to potentical conflict instead of resolution interrupted when the servers reconnect during the startup phase in order to avoid a diffferent dead lock.
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