[test] Update CP2K test

[rsarm]

Closes https://github.com/eth-cscs/reframe-tests/issues/30

[vkarak]

I suggest updating this check to new style. Currently, it's old stylish. You should remove the production and maintenance subclasses and replace them with a variant argument. Here's an outline:

@rfm.parameterized_test(['prod'], ['maint'])
class Cp2kGPUCheck(rfm.RunOnlyRegressionTest):
    def __init__(self, variant):
        if variant == 'prod':
            ...

@rfm.parameterized_test(['prod'], ['maint'])
class Cp2kCPUCheck(Cp2kCPUCheck):
    def __init__(self, variant):
        ...

[vkarak]

lgtm except for a minor comment.

[vkarak]

Please remove the reframe.out file.

[vkarak]

@jenkins-cscs retry daint

[codecov-io]

Codecov Report

Merging #559 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #559   +/-   ##
=======================================
  Coverage   91.56%   91.56%           
=======================================
  Files          72       72           
  Lines        8954     8954           
=======================================
  Hits         8199     8199           
  Misses        755      755

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