roll version to 0.94.20-SNAPSHOT

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1591477 13f79535-47bb-0310-9956-ffa450edef68
HBASE-11008 Align bulk load, flush, and compact to require Action.CREATE


git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1591494 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10958 [dataloss] Bulk loading with seqids can prevent some log entries from being replayed


git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1591495 13f79535-47bb-0310-9956-ffa450edef68