HBASE-11011 Avoid extra getFileStatus() calls on Region startup

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1588517 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10934 Provide Admin interface to abstract HBaseAdmin (Contributed by Carter)

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1588528 13f79535-47bb-0310-9956-ffa450edef68