Modifications to use Docker to run unit tests and check syntax
Fixing problem with the data left after the check syntax
Improvements done to the Docker Image and the scripts

Conflicts:
	extra/scripts/docker/Dockerfile
Changing the image name zentyal30 by zentyal/30
Adding adn removing modules to the Dockerfile
Fix problem with the unit tests script
Merge pull request #1291 from Zentyal/jjgarcia/run-unit-and-check-in-docker-3.0

Run unit and check in docker 3.0