[CLI] Add a 'destroy' command to automatically free provider resources / Add 'destroy_on_fail' tag to automatically destroy resources if infrastructure deployment fails
We want to be able to manage provider's resources without having to directly interact with the 'job scheduler' of the provider (i.e. OAR for G5k)
We also want reources to automatically be destroyed when we are iterating on our e2clab design and need to quickly launch a modified version of our infrastructure.
Services have a tendency to fail and block the rest of the infrastructure deployment.