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

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1573962 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10537 Let the ExportSnapshot mapper fail and retry on error

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1574016 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10567 Add overwrite manifest option to ExportSnapshot

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HBASE-10622 Improve log and Exceptions in Export Snapshot

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HBASE-10624 Fix 2 new findbugs warnings introduced by HBASE-10598



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