Fixed typo in DNS hunting

[danielsagi]

Description

This fixes a crash due to a typo in Kube-DNS hunting when using the network timeout option.

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.

Notes

Please mention if you have not checked any of the above boxes.

[codecov[bot]]

Codecov Report

Merging #363 into master will not change coverage. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #363   +/-   ##
=======================================
  Coverage   62.73%   62.73%           
=======================================
  Files          42       42           
  Lines        2281     2281           
=======================================
  Hits         1431     1431           
  Misses        850      850           

Impacted Files	Coverage Δ
kube_hunter/modules/hunting/dns.py	37.77% <0.00%> (ø)

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[danielsagi]

wow...this is why I prefer compiled languages like Go! Haha