nuke dead code

Signed-off-by: Brannon Jones <brannon.jones@tier3.com>
now actually talks to a container and stream processes

* add executable!
* inject container binary path and container root path
* fix codec to add linebreaks between messages
* muxer clears subscribers after seeing exit status
* fix run payload (kill -> script)

Signed-off-by: Brannon Jones <brannon.jones@tier3.com>