HBASE-12634 Fix the AccessController#requireGlobalPermission(ns) with NS

Signed-off-by: Matteo Bertozzi <matteo.bertozzi@cloudera.com>
HBASE-12204 Backport HBASE-12016 'Reduce number of versions in Meta table. Make it configurable' to branch-1
HBASE-12635 Delete acl notify znode of table after the table is deleted (Liu Shaohui)
HBASE-12637 Compilation with Hadoop-2.4- is broken