HBASE-8408 Implement namespace

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1511577 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8408 Implement namespace; ADDENDUM

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1511587 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8015 implement namespaces; ADDENDUM TWO -- REMOVE FILE REMOVED BY ORIGINAL PATCH

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1511589 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd