HBASE-11133 Add an option to skip snapshot verification after ExportSnapshot

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.98@1593770 13f79535-47bb-0310-9956-ffa450edef68
HBASE-11128 Add -target option to ExportSnapshot to export with a different name

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.98@1593776 13f79535-47bb-0310-9956-ffa450edef68