Removed the loop in Process.settle test, in favor of external looping.

From: Ben Mahler <benjamin.mahler@gmail.com>
Review: https://reviews.apache.org/r/10666

git-svn-id: https://svn.apache.org/repos/asf/incubator/mesos/trunk@1470091 13f79535-47bb-0310-9956-ffa450edef68