[1.X] Do not remove the supervisor container before every start #559
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Instead, we add a start-resin-supervisor script that checks
whether the existing container's image matches the one specified
in supervisor.conf, and just starts that container in that case.
It falls back to the docker run command that creates and starts
the supervisor container.
We also add the container removal in the update-resin-supervisor script,
after stopping the resin-supervisor service.
Connects to #184
Also connects to #280 as it should make the issue appear way less often.