Add upgrade-bifrost command

This performs the same as a deploy-bifrost, but first stops the
bifrost services and container if they are running.

This can help where a docker stop may lead to an ungraceful shutdown,
possibly due to running multiple services in one container.

Change-Id: I131ab3c0e850a1d7f5c814ab65385e3a03dfcc74
Implements: blueprint bifrost-upgrade
Closes-Bug: #1834332