Improves lunar-devel jenkins test stability (backport to kinetic-devel) #1578
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Backport of #1135 to
kinetic-devel
. Fixes flaky unit testCallbackQueue.raceConditionCallback
on kinetic-devel (http://build.ros.org/job/Kpr__ros_comm__ubuntu_xenial_amd64/464/).This patch has not been selected for backporting to kinetic in #1205 for some reason, although it cleanly applies and only affects unit tests: