Add worker processer to run puppet agent

[everestx]

After the initial deployment to an app server, we want to initiate a puppet run. This would be in the 'deploy' task and before the 'touch tmp/restart.txt' or 'touch app_init.wsgi' actions.

The goal would be:

1. Determine if the puppet run is needed (did mkdir create a new deploy_path)
2. Run puppet (check exit code). Watch out puppet agent exit codes can be diverse
3. Initiate passenger or wsgi restart only of the puppet agent run was successful

[rmb938]

This all could be done very easily once the app types get moved to python classes. Currently with the json structure it is not very easy to do logic calculations.

[everestx]

Yes, but there's some consideration to be made on whether action/logic should live in the actual processors or in the task/actions. I'm still wrapping my own head around those on a case by case basis.