Fixes to make Artifactor able to return data

* Made DockerBot only report failures in the log report
* Videoer is now unable to log due to nested fire_hooks not being
  supported in Artifactor yet
* log.py small changes to keep JSON happy
* Artifactor is now a separate process so that TCP communications are
  not deadlocked in the same process
Merge pull request #971 from psav/art_fix

Fixes to make Artifactor able to return data