Metacat

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.

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).

verify checksum when retrieving replica from another member node.
https://redmine.dataone.org/issues/1794

make sure to get/put system metadata to the HZ map instead of using IdentifierManager directly
verified changes for: https://redmine.dataone.org/issues/1999

look-up sych schedule from metacat properties instead of hardcoding them
https://redmine.dataone.org/issues/1933

when comparing D1 Subject objects, use the equals() method not direct string comparison
https://redmine.dataone.org/issues/2050