[WIP] Make vtpm run as a non-root user

[shjala]

I'm trying to make vtpm run with a non-root user, I have tried the USER configuration in docker file and also in the docker-compose file, but for some reason unknown to me it is not respected, and no matter what it gets executed as root user in run-time.

This is a hacky way to make it run as a non-root user and be functional.

any alternative solution?

[shjala]

@rouming

[eriknordmark]

@shjala with apparmor in place, are you still pursuing this PR? If so we need to pull in @deitch to figure out the issues.

[shjala]

@eriknordmark yes I would like to have both DAC and MAC properly in place, I will try once more and then ask Avi if unsuccessful.