[HBASE-9930] Merge the Swift branch with Trunk

Summary: This revision merges the Swift branch with Trunk.

Test Plan: MR Unit Tests

Reviewers: manukranthk, adela, fan, daviddeng, liyintang, aaiyer, rshroff

Reviewed By: fan

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.89-fb@1576878 13f79535-47bb-0310-9956-ffa450edef68