HBASE-9234 Rebuilding user regions should ignore system tables

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1515137 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9246 Remove ROOT_TABLEDESC, ROOT_REGIONINFO, and ROOT_TABLE_NAME


git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1515160 13f79535-47bb-0310-9956-ffa450edef68