Run preDeploy in parallel

[yvespp]

Liima currently requires a preDeployment script that calls the REST service to move a deployment form preDeploymen to the deployment phase. To make it easier to set up Liima, the logic to run preDeployment in parallel and to update the deployment Job should be moved from the script to Liima itself:

• Liima should start all preDeployment jobs in parallel.
• The template generation of preDeployment can run serially. If it fails the deployment should be marked as failed.
• If a job finished and exit code is 0, Liima should update the job status to successful. If exit code is not 0 Liima should mark the job as failed.