Submitting multiplexing backend for resource manager

git-svn-id: https://svn.apache.org/repos/asf/oodt/trunk@1634142 13f79535-47bb-0310-9956-ffa450edef68
Adjusting changes.txt for OODT-764

git-svn-id: https://svn.apache.org/repos/asf/oodt/trunk@1634143 13f79535-47bb-0310-9956-ffa450edef68
OODT-699: Cluster managment tools for mesos cluster.

git-svn-id: https://svn.apache.org/repos/asf/oodt/trunk@1634173 13f79535-47bb-0310-9956-ffa450edef68