HBASE-10616. Integration test for multi-get calls

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/hbase-10070@1577372 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10743. Replica map update is problematic in RegionStates

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/hbase-10070@1577384 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10616. Addendum that fixes the case of multiget_batchsize == 1

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/hbase-10070@1577438 13f79535-47bb-0310-9956-ffa450edef68