[WFLY-1430] First cut of cluster subsystem.
[WFLY-1430] Add in XML processing, test cases.
[WFLY-1430] Fix up org.wildfly.extension.cluster module integration.
[WFLY-1430] Add in custom resources for name and deployment.
[WFLY-1430] Reorganize ManagementAPIClusterSupport installation and start/stop.
[WFLY-1430] Rename module artifact.
[WFLY-1430] Introduce i18n changes. Tidy up exception handling in attribute handlers.
[WFLY-1430] Add VIEW_HISTORY and RPC_STATS attributes.
[WFLY-1430] Add OPERATION_STATS, RPC_STATS, TXN_STATS, DISTRIBUTION attributes.
[WFLY-1430] Mark cache responses as possibly not in view; add logging.
[WFLY-1430] Modfify attribute definitions to reflect LIST structure.
[WFLY-1430] Enable subsystem resources only conditional on runtime registration being valid.
Port cluster subsystem to new wildfly-clustering-api.
[WFLY-1430] Some small typos.
[WFLY-1430] Move subsystem dispatcher code into separate maven module, monitoring.
[WFLY-1430] Fix up display of results.
[WFLY-1430] Make CommandDispatcher start when channel starts.
[WFLY-1430] Refactor maven module organization.
[WFLY-1430] Change subsystem name to clustering-monitor.
[WFLY-1430] Port clustering-monitor subsystem to new CommandDispatcher api.