Add OnDemandShardState to report additional Shard state

Add OnDemandShardState to report additional Shard state

Extended the OnDemandRaftState with OnDemandShardState to include
additional Shard state, including DTCL, DCL, and commit cohort actors.
This will enable us to report thus info from the JMX bean as it's useful
for debugging to have visibility into what listeners and cohorts
are registered.

The actors now also store the registered path. Both the instance and path
will be queried for debugging.

Change-Id: Iaa6c27c9aba3b5c0223199e6a3fc21bc54da95ba
Signed-off-by: Tom Pantelis <tpanteli@brocade.com>