[test] Adapt IOR checks to build systems

[teojgo]

Fixes #497

[teojgo]

@jenkins-cscs retry dom

[vkarak]

It seems also that the maintenance tag has been disappeared. Filtering the tests with -t maintenance yields nothing.

[vkarak]

[..., '-o', self.test_file]

[vkarak]

task -> num_tasks or nt.

[teojgo]

There was no maintenance tag, there was the ops one.

[vkarak]

@teojgo No, there should be a maintenance tag:

• On master:

./bin/reframe -C config/cscs.py -c cscs-checks/system/io/ior_check.py -t maintenance -l

List of matched checks
======================
  * ior_read_check_users (found in /users/karakasv/Devel/reframe/cscs-checks/system/io/ior_check.py)
        descr: IOR check (/users)
        tags: {/users,read,ops,maintenance}, maintainers: ['SO', 'MP']
  * ior_write_check_users (found in /users/karakasv/Devel/reframe/cscs-checks/system/io/ior_check.py)
        descr: IOR check (/users)
        tags: {/users,write,ops,maintenance}, maintainers: ['SO', 'MP']
Found 2 check(s).

• On your branch

List of matched checks
======================
Found 0 check(s).

[codecov-io]

Codecov Report

Merging #505 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #505   +/-   ##
=======================================
  Coverage   91.39%   91.39%           
=======================================
  Files          72       72           
  Lines        8737     8737           
=======================================
  Hits         7985     7985           
  Misses        752      752

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