[test] Fix CDO checks

[omlins]

The CDO version installed on Daint/Dom is not the same as the one on Tsa/Arolla and they print a different message in case of success. This PR generalizes the sanity check to work with both CDO versions.

[pep8speaks]

Hello @omlins, Thank you for updating!

Cheers! There are no PEP8 issues in this Pull Request!Do see the ReFrame Coding Style Guide

Comment last updated at 2020-02-19 08:32:03 UTC

[lucamar]

Thanks @omlins

[vkarak]

@omlins Can you please put in the description the internal issues that this one fixes?

[vkarak]

It seems to be breaking the test on Tsa and also I'd like to know if the changes for Tsa before has broken the test on other systems.

[omlins]

@jenkins-cscs retry tsa

[omlins]

@jenkins-cscs retry all

[omlins]

@jenkins-cscs retry all

[vkarak]

lgtm

[vkarak]

@jenkins-cscs retry none

[codecov-io]

Codecov Report

Merging #1179 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1179      +/-   ##
==========================================
+ Coverage   91.99%   92.02%   +0.02%     
==========================================
  Files          81       81              
  Lines       11693    11736      +43     
==========================================
+ Hits        10757    10800      +43     
  Misses        936      936

Impacted Files	Coverage Δ
unittests/test_utility.py	99.23% <100%> (+0.01%)	⬆️
reframe/frontend/cli.py	80.93% <100%> (+0.05%)	⬆️
reframe/utility/os_ext.py	91% <100%> (+0.72%)	⬆️
unittests/test_cli.py	93.69% <100%> (+0.24%)	⬆️

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