Resource Monitoring 12: Split apart the monolithic slave controller.

From: Ben Mahler <benjamin.mahler@gmail.com>
Review: https://reviews.apache.org/r/9268

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1449846 13f79535-47bb-0310-9956-ffa450edef68
Resource Monitoring 13: Added executor resource usage to webui.

From: Ben Mahler <benjamin.mahler@gmail.com>
Review: https://reviews.apache.org/r/9269

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1449847 13f79535-47bb-0310-9956-ffa450edef68