HBASE-10220. Put all test service principals into the superusers list

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1552949 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10221. Region from coprocessor invocations can be null on failure

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1552969 13f79535-47bb-0310-9956-ffa450edef68