Changes in `self.job.options` are inheritted in subsequent tests

[teojgo]

Changes made in self.job.options made in one test case, propagate in subsequent tests. For example once the change in made here https://github.com/eth-cscs/reframe/blob/a83cb2142cbd7d40a78336e055f1b78f6a922eea/cscs-checks/system/slurm/slurm.py#L182 then the following tests will run using altered job.options. This seems to be the case since a change made to that test changes the sched_options field of the executor policy which was used during the task setup https://github.com/eth-cscs/reframe/blob/a83cb2142cbd7d40a78336e055f1b78f6a922eea/reframe/frontend/executors/policies.py#L64

[vkarak]

That's a major problem!

[vkarak]

Can you check when this was introduced?

[teojgo]

@vkarak I think that it was always there but it just surfaced because we added the --account job option in slurm tests.

[vkarak]

The fix should be easy. Just create a new list out of sched_options here.