HBASE-9534: Short-Circuit Coprocessor HTable access when on the same server

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1524522 13f79535-47bb-0310-9956-ffa450edef68
CHANGES.txt for 0.94.12RC1

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1524534 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/0.94' into 0.94-gd