HBASE-9708 Improve Snapshot Name Error Message (Esteban Gutierrez)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1573950 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10622 Improve log and Exceptions in Export Snapshot

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1574033 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10624 Fix 2 new findbugs warnings introduced by HBASE-10598



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1574152 13f79535-47bb-0310-9956-ffa450edef68