Allow specifying /proc and other needed folders #558

The use case of this is running monitoring tools or scripts built around psutil that run inside docker continents. With docker the admin can specify that the /proc of the host machine is read only and mounted in a location on the sub continent the issue for this is that /proc room the host maybe /proc_host and then you need to read things from there for monitoring. An issue that comes up is CoreOS and a few other docker OS dont have package managers so there is no way to really install tools there its expected that the user installs the tools in a docker container.