HBASE-11492 Hadoop configuration overrides some ipc parameters including tcpNoDelay (Nicolas Liochon)
Amend HBASE-11497 Expose RpcScheduling implementations as LimitedPrivate interfaces (Matteo Bertozzi)

Changes RpcScheduler from an interface into an abstract class
HBASE-11513 Combine SingleMultiple Queue RpcExecutor into a single class (Jesse Yates)
HBASE-11302 ReplicationSourceManager#sources is not thread safe (Qianxi Zhang)
HBASE-11442 ReplicationSourceManager doesn't cleanup the queues for recovered sources (Virag Kothari)