HBASE-9347 Support for enabling servlet filters for REST service (Vandana Ayyalasomayajula)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1523021 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9375 [REST] Querying row data gives all the available versions of a column (Vandana Ayyalasomayajula)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1523034 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9471 htrace synchronized on getInstance

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1523040 13f79535-47bb-0310-9956-ffa450edef68