Moved partner message from first phase result over to protocol buffers.
Transferred additional subscriber message to protocol buffers.
Transitioned partner removed subscriber message to protocol buffers.
Switched backout commit request to protocol buffers.
Switched requests to complete the commit (ie., finish second phase of commit) over to protocol buffers.
This commit transitions the last message type (partner commit
requests) over to protocol buffers.  The next several commits will be
a lot of code cleanup.
Removed defunct waldoMessage class.  Using protocol buffers instead.
Protocol buffers already compresses data for us.  No need to try to compress the output of the protocol buffer as well.