Before, Nomad executions often got stopped because the runner was deleted.
With the previous commit, we cover the exception to this behaviour by stopping the execution Poseidon-side.
These different approaches lead to different context error messages.
In this commit, we move the check of the passed timeout, to respond with the corresponding client message again.
Destroying the runner when Nomad informs us about its allocation being stopped, fixes the error of executions running into their timeout even if the allocation was stopped long ago.
- Abstracting from the exec form while generating.
- Removal of single quotes (usage of only double-quotes).
- Bash-nesting using escaping of special characters.
