Add area name to "area kept" log message

[gerritholl]

When logging a debug message that an area is kept because of sufficient area coverage, add the name of the area.

This will break backward compatibility with systems searching for this exact log message.

• [ ] Closes #101
• [x] Tests added
• [x] Tests passed
• [x] Passes flake8 trollflow2
• [ ] Fully documented
• [ ] Add your name to AUTHORS.md if not there already

[ghost]

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[mraspaud]

I just made a dummy commit for triggering the actions.

[codecov[bot]]

Codecov Report

Merging #101 (d26a3cf) into master (163ba83) will increase coverage by 1.05%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #101      +/-   ##
==========================================
+ Coverage   92.44%   93.50%   +1.05%     
==========================================
  Files          10        9       -1     
  Lines        1654     1677      +23     
==========================================
+ Hits         1529     1568      +39     
+ Misses        125      109      -16     

Flag	Coverage Δ
unittests	93.50% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
trollflow2/plugins/__init__.py	91.04% <100.00%> (+0.08%)	:arrow_up:
trollflow2/tests/test_trollflow2.py	99.85% <100.00%> (+<0.01%)	:arrow_up:
trollflow2/__init__.py	66.66% <0.00%> (-33.34%)	:arrow_down:
setup.py
trollflow2/tests/test_launcher.py	98.45% <0.00%> (+0.14%)	:arrow_up:
trollflow2/launcher.py	76.21% <0.00%> (+1.32%)	:arrow_up:
trollflow2/dict_tools.py	94.23% <0.00%> (+7.69%)	:arrow_up:

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