Metacat

Set a default HazelcastInstance after init() is called, and use this instance in getLock() to acquire a lock in the cluster.

use shared method for looking up "docInfo" map -- both in Metacat replication and in D1 system metadata generation

When using ILock.lock(), get a lock on the string value of the Identifier, not the Identifier object itself. Hazelcast locking won't work otherwise.

Use the Hazelcast ILock mechanism to lock the system metadata identifier rather than using IMap.lock(pid).

delete system metadata when MN.delete() is called.

make MNodeServiceTest pass JUnit testing

return null instead of throwing an exception when pid is not found in store

comment out resynch() method until errors are resolved

use default hazelcast config when not configured to use an external one

For now, remove the hzClient code connecting to the DataONE process cluster to get the hzNodes map. This will be moved into the storage cluster, but use D1Client to get the node list for now.