Add a flag to Start command to stop VM Runtime when entrypoint exits

[pwalski]

In docker if a process is automatically started by the ENTRYPOINT or CMD configuration values, the container will shutdown when the process exits.

Similar to start-entrypoint an exit-with-entrypoint or similarly named flag should be added to the Start command (with the accompanying capability) to allow the requestor to better match the workings of the VM with Docker.