Fix bug when deleting a job

[robert-clegg-tessella]

Requesting that a job be deleted caused a 500 Internal Server Error (regardless of whether the job existed or not). This was caused by a poorly-formatted body provided by the python kubernetes library.

The route is deletejob, e.g. URL http://host-172-16-113-146.nubes.stfc.ac.uk:31924/deletejob

Acceptance criteria

• After submitting a job, requesting deletion results in a 200 Ok response. Subsequent attempts to delete or to get the status of the job result in a 404 Not Found response.

Test Scenarios

• Test that a delete job returns a 200 status.
• Test that a delete job on job that doesn't exit gives a 404 status.
• Check the delete requests response time for a small job and a large job (if applies)
• Check that responses content header meet OWASPs ASVS checklist.

[vidhyamanojkumar]

Are there any user access restrictions? Can anyone delete a job?

[robert-clegg-tessella]

@vidhyamanojkumar There is currently no user auth in the system. This is not currently considered a priority, but we have designed the system so that implementing auth would be relatively straightforward in the future.