HBASE-10483 Provide API for retrieving info port when hbase.master.info.port is set to 0 (Liu Shaohui)

Conflicts:
	hbase-client/src/main/java/org/apache/hadoop/hbase/client/HBaseAdmin.java
	hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/MasterAddressTracker.java
	hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/generated/ZooKeeperProtos.java