DTT2 - Validate provision playbook execution and error report

[mhamra]

Target version	Related issue	Related PR/dev branch
TBD	#5220

The provision module executes Ansible playbooks. If the execution fails, it should return an exit code to inform that something has failed.

For example, investigating issue #5220, we found that the allocation module did not create the manager's virtual machine. The provision module could not execute the playbook, receiving an SSH authentication error, but the script exited without informing errors (exit code > 0).