HBASE-8684: Table Coprocessor can't access external HTable by default

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1490068 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8684: Table Coprocessor can't access external HTable by default - ADDENDUM: moving test to correct package

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1490076 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8636: Backport KeyValue Codec to 0.94 (HBASE-7413)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1490079 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/0.94' into 0.94-gd