Refine the code.
Refine the ut.
Move the tmp to the MobConstants.java
Add a method to the MobFileName.java
Refine the code.
Refine the code.
Merge remote-tracking branch 'origin/hbase-11339-core' into hbase-11339-metrics

Conflicts:
	hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HMobStore.java