Update file connector and google drive connector

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-1067@1630083 13f79535-47bb-0310-9956-ffa450edef68
Hook up gridfs connector

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-1067@1630087 13f79535-47bb-0310-9956-ffa450edef68