HBASE-10825 Add copy-from option to ExportSnapshot

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.98@1581911 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10838 Insufficient AccessController covering permission check (Anoop Sam John)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.98@1581941 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10829 Flush is skipped after log replay if the last recovered edits file is skipped

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.98@1581954 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10833: Region assignment may fail during cluster start up

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.98@1582116 13f79535-47bb-0310-9956-ffa450edef68