Create JMX bean command handlers for system commands

[allanmckenzie]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 1033

• 86 of 105 (81.9%) changed or added relevant lines in 13 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.4%) to 91.344%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
event-store-management/src/main/java/uk/gov/justice/services/eventstore/management/catchup/events/CatchupCompletedForSubscriptionEvent.java	14	16	87.5%
event-store-management/src/main/java/uk/gov/justice/services/eventstore/management/catchup/events/CatchupStartedEvent.java	8	10	80.0%
event-store-management/src/main/java/uk/gov/justice/services/eventstore/management/catchup/events/CatchupStartedForSubscriptionEvent.java	11	13	84.62%
event-store-management/src/main/java/uk/gov/justice/services/eventstore/management/rebuild/events/RebuildRequestedEvent.java	11	13	84.62%
event-store-management/src/main/java/uk/gov/justice/services/eventstore/management/catchup/events/CatchupCompletedEvent.java	7	10	70.0%
event-store-management/src/main/java/uk/gov/justice/services/eventstore/management/catchup/events/CatchupRequestedEvent.java	9	13	69.23%
event-store-management/src/main/java/uk/gov/justice/services/eventstore/management/rebuild/events/RebuildStartedEvent.java	9	13	69.23%

Totals
Change from base Build 1016:	-0.4%
Covered Lines:	2216
Relevant Lines:	2426

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💛 - Coveralls