Fix srun protocol for EDF clusters.

Fix srun protocol for EDF clusters.

This commit fixes the following problem when using more than 1 node for running
a YACS schema : it was not possible to run more than one container on the second
node and the next ones. We had this type of message:

srun: Job 2703790 step creation temporarily disabled, retrying
srun: error: Unable to create step for job 2703790: Job/step already completing or completed