Project: mesos
Issue MESOS-4839: Move placement new processes into the freezer cgroup into a parent hook.
The Linux Launcher places new processes into the freezer cgroup. This is currently done by a combination of childSetup function (blocking the new process until parent is done) and the parent (placing child process into the cgroup and then signaling child to continue). ParentHooks support this behavior (blocking child until some work is done in the parent) in a much cleaner way.
Story points: 3