HBASE-10672. Table snapshot should handle tables whose REGION_REPLICATION is greater than one

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/hbase-10070@1575096 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10620. LoadBalancer.needsBalance() should check for co-located region replicas as well

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/hbase-10070@1575097 13f79535-47bb-0310-9956-ffa450edef68