Eliminated redundant boost, glog, and gmock/gtest.

Review: https://reviews.apache.org/r/9630

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1451092 13f79535-47bb-0310-9956-ffa450edef68
Made stout independent of libprocess and Mesos.

Review: https://reviews.apache.org/r/9631

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1451093 13f79535-47bb-0310-9956-ffa450edef68
Moved preprocessor.hpp into stout.

Review: https://reviews.apache.org/r/9634

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1451094 13f79535-47bb-0310-9956-ffa450edef68