Fixed a bug in the slave that crashed it when
hitting /statistics/snapshot.json.

From: Ben Mahler <benjamin.mahler@gmail.com>
Review: https://reviews.apache.org/r/9748

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1453146 13f79535-47bb-0310-9956-ffa450edef68
Removed silencing of some of the build commands.

From: Ben Mahler <benjamin.mahler@gmail.com>
Review: https://reviews.apache.org/r/9761

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1453147 13f79535-47bb-0310-9956-ffa450edef68