Take snapshot after recovery on migrated messages

Take snapshot after recovery on migrated messages

Modified RaftActorRecoverySupport to capture and persist a snapshot
after recovery when there are migrated messages recovered. It utilizes
the new MigratedSerializable interface.

I also created equivalent classes in the persisted packages for
UpdateElectionTerm, DeleteEntries and ApplyJournalEntries that implement
MigratedSerializable and use the Externalizable proxy pattern. The
existing classes were deprecated and readResolve to the new classes.

Change-Id: Ia2e664de9ffd59991c49160424b13bc8ca0bfcbf
Signed-off-by: Tom Pantelis <tpanteli@brocade.com>