Rebased CONNECTORS-818 branch

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-818@1550084 13f79535-47bb-0310-9956-ffa450edef68
Merge in changes from original CONNECTORS-818 branch

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-818-2@1550494 13f79535-47bb-0310-9956-ffa450edef68