HBASE-10638 Improve error message when there is no region server available for move
HBASE-10638 Improve error message when there is no region server available for move



git-svn-id: eacefbb430aa6993bec52677de2e7e10bea24366@1573008 13f79535-47bb-0310-9956-ffa450edef68

mapr/hbase,mapr/hbase,mapr/hbase,mapr/hbase,mapr/hbase,mapr/hbase,mapr/hbase,mapr/hbase,mapr/hbase