HBASE-5444: Add PB-based calls to HMasterRegionInterface
Review Request #4463 - Created March 23, 2012 and updated
Adds PB-based calls replacing HMasterRegionInterface. There are some temporary hacks, e.g. converting PB-based ServerLoad to existing HServerLoad so I didn't need to convert ClusterStatus (which brings in a lot of other changes). That will be cleaned up in HBASE-5445.
Ran jenkins job, all unit tests passed.