repurpose

* Monitor manifest file(s)
* Recreate containers in response to manifest changes
* Kill containers in namespace that are not listed in manifest file(s)
* Internalize container keep-alive loop so that killing the container-agent lets you kill the containers.
* Use standard logging lib.
* Use docker client from docker-stress
* Remove infrastructure containers and container network stack sharing
* Remove manifest version check given substantial capability & behavior divergence
* Log errors instead of exiting on configuration validation failures.