Fixed bug in etcd hunting

[danielsagi]

Description

Etcd hunting was failing due to accessing an uninitialized protocol property of hunter. Protocol property is set on events, this was a typo.

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 #364 into master will decrease coverage by 0.04%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #364      +/-   ##
==========================================
- Coverage   62.77%   62.73%   -0.05%     
==========================================
  Files          42       42              
  Lines        2281     2281              
==========================================
- Hits         1432     1431       -1     
- Misses        849      850       +1     

Impacted Files	Coverage Δ
kube_hunter/modules/hunting/etcd.py	33.75% <0.00%> (ø)
kube_hunter/core/events/handler.py	90.09% <0.00%> (-1.00%)	:arrow_down:

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