Network operations timeout

[iyehuda]

Description

When probing kube-apiserver or any other network service, timeout after given amount of seconds.

This prevents kube-hunter from running for long time, when you hit slowly responding server during the discovery/network is blocked by firewall.

Contribution Guidelines

Please Read through the Contribution Guidelines.

Fixed Issues

Fixes #35

Contribution checklist

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

Notes

Originally written by @invidian

[lizrice]

Codecov Report

Merging #317 into master will decrease coverage by 0.45%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #317      +/-   ##
==========================================
- Coverage   60.46%   60.01%   -0.46%     
==========================================
  Files          41       41              
  Lines        1945     1963      +18     
==========================================
+ Hits         1176     1178       +2     
- Misses        769      785      +16     

Impacted Files	Coverage Δ
kube_hunter/modules/hunting/apiserver.py	69.63% <0.00%> (-1.99%)	:arrow_down:
kube_hunter/core/events/handler.py	90.90% <0.00%> (+1.01%)	:arrow_up:
kube_hunter/modules/discovery/ports.py	88.46% <0.00%> (+11.53%)	:arrow_up:

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