Rename the CONNECTORS-553-2 branch

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-553@1550125 13f79535-47bb-0310-9956-ffa450edef68
Commit changes from old CONNECTORS-553 branch

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-553-2@1550464 13f79535-47bb-0310-9956-ffa450edef68