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* Support for Management Server Maintenance - New APIs: prepareForMaintenance and cancelMaintenance, with required parameter - managementserverid. - New management server states for maintenance: PreparingForMaintenance, Maintenance. - listHosts API with optional parameter – managementserverid, to list the hosts connected to the management server. - Support management server maintenance when more than one active management servers available. - Triggers transfer agents to other available management servers for maintenance, new agent command MigrateAgentConnectionCommand to initiate transfer of indirect agents. - New global config 'management.server.maintenance.timeout', to set the timeout (in mins) for the management server maintenance window, default: 60 mins. - UI changes: Prepare and Cancel Maintenance in Management Server section, Connected Agents tab, New fields for hosts and management servers. * Updated pending jobs check timer task with ScheduledExecutorService * keep maintenance state on trigger shutdown call when ms is in maintenance * add pending jobs count to ms response * during ms heartbeat, update state to up only when it's down * allow vm work jobs of async job created before prepare for maintenance * Revert "keep maintenance state on trigger shutdown call when ms is in maintenance" This reverts commit 607e13364679eac897f4d146bb3325ea7a61ba17. * skip maintenance test when multiple management servers are not available, and not configured in host setting for kvm