Adding support for log redirection using --log-file option (#329)

[milindchawre]

Description

Fixes #329 Added --log-file option to redirect log output to a user specified file.

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Fixes #(329)

"BEFORE" and "AFTER" output

To verify that the change works as desired, please include an output of terminal before and after the changes under headings "BEFORE" and "AFTER".

BEFORE

No way to redirect log output to any file.

AFTER

Contribution checklist

• [x] I have read the Contributing Guidelines.
• [x] The commits refer to an active issue in the repository.
• [x] I have added automated testing to cover this case.

Notes

Have modified the existing test case for logging. Not completely sure whether that is enough.

[codecov[bot]]

Codecov Report

Merging #387 into master will increase coverage by 0.09%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #387      +/-   ##
==========================================
+ Coverage   63.42%   63.52%   +0.09%     
==========================================
  Files          42       42              
  Lines        2286     2289       +3     
==========================================
+ Hits         1450     1454       +4     
+ Misses        836      835       -1     

Impacted Files	Coverage Δ
kube_hunter/conf/__init__.py	95.83% <100.00%> (+0.18%)	:arrow_up:
kube_hunter/conf/logging.py	100.00% <100.00%> (ø)
kube_hunter/conf/parser.py	76.92% <100.00%> (+0.92%)	:arrow_up:
kube_hunter/core/events/handler.py	91.08% <0.00%> (+0.99%)	:arrow_up:

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[milindchawre]

ping @iYehuda

[NickYan7]

Nice job! And how can I redirect the result when I use docker to deploy the kube-hunter? Such as I execute docker run -it --rm --network host xxx/kube-hunter, the --log-file is not work... If I execute docker run -it --rm --network host xxx/kube-hunter > ./result.txt, it won't accept the any parameter so that I can't use kube-hunter by option 2 (Interface Scaning).

I also tried echo 2 | docker run -it --rm --network host xxx/kube-hunter > ./scan_result.txt, it is not work although... 😂

Check this please, thanks a lot

@milindchawre