[test] Fix QE check on Eiger and Pilatus

[lucamar]

By mistake OMP_NUM_THREADS was set equal to str(self.num_cpus_per_task) (which is 16), rather than 8: in this way the performance of the job is almost half than expected. Defining self.num_cpus_per_task = 16 and then OMP_NUM_THREADS = 8 for some reason gives a slightly better performance with respect to setting directly self.num_cpus_per_task = 8.

[codecov-commenter]

Codecov Report

Merging #2015 (2c6dc9b) into master (52a313e) will not change coverage.
The diff coverage is n/a.

❗ Current head 2c6dc9b differs from pull request most recent head 039f40c. Consider uploading reports for the commit 039f40c to get more accurate results

@@           Coverage Diff           @@
##           master    #2015   +/-   ##
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  Coverage   87.48%   87.48%           
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  Files          50       50           
  Lines        8848     8848           
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  Hits         7741     7741           
  Misses       1107     1107           

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[teojgo]

@jenkins-cscs retry pilatus