HBASE-12361 Show data locality of region in table page (Liu Shaohui)

Conflicts:
	hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
	hbase-server/src/main/resources/hbase-webapps/master/table.jsp
HBASE-12219 Cache more efficiently getAll() and get() in FSTableDescriptors

Signed-off-by: Andrew Purtell <apurtell@apache.org>