Metacat

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

simplify SystemMetadata generation -- will be done during Metacat upgrade for D1 features/support.

clean up populator; use IOUtils library to do string<->stream conversions

Set sessionid for clientVeiwBean when it handle a request.
Always set the order type to "allowFirst".

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

match documentation for the MN.describe() header
https://redmine.dataone.org/issues/1904

configure synch schedule in the admin screen
https://redmine.dataone.org/issues/1933

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