Metacat

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

no need to cast docInfo entries to String -- they are all strings

set revision history, the create/update dates and the owner/submitter (correctly)

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

make default formatting a little bit easier to read

reformat code -- no changes

refactor SystemMetadata creation into separate class from the MetacatHandler -- this will be shared by upgrade code and normal metacat api.

include all document revisions when generating "missing" system metadata
TODO: revision graph captured in obsoletes/obsoletedBy

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).