JAVA-609, JAVA-586, JAVA-749: Major changes to ObjectId class. The major change is that ObjectId now conforms to the spec. Instead of representing as 3 4-byte value, it now properly uses a 4-byte timestamp, 3-byte machine identifier, 2-byte process identifier, and 3-byte counter.

The logic for generating machine identifier has changed.  Since we are java 6 minimum now, using NetworkInterface.getHardwareAddress() for more uniqueness.

The logic for generating process identifier has changed.  It attempts to get the actual numeric process id from JMX, falling back to a string hash only if if it can't.  It looks for a pattern in the process name of <process_id>@<host_name>.  No longer using the classloader hash either, since each class loader will have a separate instance of NEXT_COUNTER, which is seeded with a random number and so is very unlikely to clash.

Removed a bunch of stuff

 Removed support for 'babble' format.
 Removed constructors that didn't conform to the spec (machine identifier only, instead of machine identifer and process identifier)
 Removed support for isNew/notNew.  I don't see a need for this.  It was only used in save method, and it seems the only purpose is to decide whether to do an insert of an upsert.  I don't see any harm in always doing an upsert.  This also has
 the nice property of making ObjectId immutable.
 Removed a bunch of poorly named methods: _flip(int), _inc(), _machine(), _time()
 Removed massageToObjectId(java.lang.Object)' factory method

 Other non-backwards compatible changes:

  equals method will no longer compare equal to anything but an ObjectId

 Additionally, added getters that conform to the spec: timestamp, machineIdentifier, processIdentifier, and counter.  Deprecated the old ones.

Author: jyemin