HBASE-10804 Add a validation step to ExportSnapshot

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.98@1581410 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10828 TestRegionObserverInterface#testHBase3583 should wait for all regions to be assigned



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.98@1581514 13f79535-47bb-0310-9956-ffa450edef68