Fixed bug in certificate hunting

[danielsagi]

Description

Certificate hunting was failing because of multiple newlines in certificates returns from ssl.get_server_certificate. Essentially the PEM footer was not stripped, causing the b64decode to fail.

Contribution checklist

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

[codecov[bot]]

Codecov Report

Merging #365 into master will increase coverage by 0.04%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #365      +/-   ##
==========================================
+ Coverage   62.73%   62.77%   +0.04%     
==========================================
  Files          42       42              
  Lines        2281     2281              
==========================================
+ Hits         1431     1432       +1     
+ Misses        850      849       -1     

Impacted Files	Coverage Δ
kube_hunter/modules/hunting/certificates.py	93.33% <100.00%> (ø)
kube_hunter/core/events/handler.py	91.08% <0.00%> (+0.99%)	:arrow_up:

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