[bugfix] Process execution modes before configuring logging

[vkarak]

Fixes #1379.
Fixes UES-913.

[codecov-commenter]

Codecov Report

Merging #1399 into master will increase coverage by 0.31%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1399      +/-   ##
==========================================
+ Coverage   91.46%   91.77%   +0.31%     
==========================================
  Files          83       83              
  Lines       12277    12708     +431     
==========================================
+ Hits        11229    11663     +434     
+ Misses       1048     1045       -3     

Impacted Files	Coverage Δ
reframe/frontend/cli.py	78.81% <100.00%> (+0.66%)	⬆️
reframe/utility/color.py	100.00% <0.00%> (ø)
reframe/core/containers.py	100.00% <0.00%> (ø)
unittests/test_argparser.py	100.00% <0.00%> (ø)
unittests/test_check_filters.py	100.00% <0.00%> (ø)
unittests/test_sanity_functions.py	100.00% <0.00%> (ø)
...ittests/resources/checks_unlisted/kbd_interrupt.py	100.00% <0.00%> (ø)
unittests/test_deferrable.py	99.62% <0.00%> (+<0.01%)	⬆️
unittests/test_buildsystems.py	99.16% <0.00%> (+<0.01%)	⬆️
reframe/core/buildsystems.py	96.75% <0.00%> (+0.01%)	⬆️
... and 34 more

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[ekouts]

lgtm