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* Update last agents during ms maintenance, and some code improvements * Send 503 (Service Unavailable) response status when maintenance or shutdown is initiated [Any load balancer in the clustered environment can avoid routing requests to this MS node] * Migrate systemvm agents before routing host agents, and some code improvements * Added events for ms maintenance and shutdown operations * Added the following ms maintenance and shutdown improvements - block new agent connections during prepare for maintenance of ms - maintain avoids ms list - propagate updated management servers list and lb algorithm in host and indirect.agent.lb.algorithm settings respectively, to systemvm (non-routing) agents - updated setup ms list and migrate agent connections to executor service - migrate agent connection through executor, and send the answer to the ms host that initiated the migration - re-initialize ssl handshake executor if it is shutdown - don't allow prepare for maintenance or shutdown when other management server nodes are in preparing states - don't allow trigger shutdown when management server is up and other management server nodes are in preparing states - stop agent connections monitor on ms maintenance - update avoid ms list in ready command - updated connected host from the client connection - update last agents in ms metrics from the database - updated some agent config descriptions - update last management server in the hosts during shutdown - added agents and lastagents in management server response - updated management server maintenance & shutdown unit tests - some code improvements * refactored code / addressed comments * removed shutdown testcase (maybe, calling System.exit) * Revert "removed shutdown testcase (maybe, calling System.exit)" This reverts commit e14b0717152ef6c8be102d61c80f42803a53172e. * avoid system.exit during shutdown test * code improvements * testcase fix * Fix cutoff time in agent connections monitor thread