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

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1573947 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9999 Add support for small reverse scan

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1573949 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9999 Add support for small reverse scan - with new files

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1573951 13f79535-47bb-0310-9956-ffa450edef68