Fix linter errors

[Aleksao998]

Description

This PR fixes latest linter errors

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have updated the official documentation
• I have added sufficient documentation in code

Testing

• I have tested this code with the official test suite
• I have tested this code manually

[codecov]

Codecov Report

Merging #697 (f3777f3) into develop (de62840) will decrease coverage by 0.17%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop     #697      +/-   ##
===========================================
- Coverage    48.77%   48.59%   -0.18%     
===========================================
  Files          112      112              
  Lines        15382    15385       +3     
===========================================
- Hits          7502     7477      -25     
- Misses        7249     7274      +25     
- Partials       631      634       +3     

Impacted Files	Coverage Δ
consensus/ibft/consensus_backend.go	0.00% <0.00%> (ø)
consensus/ibft/ibft.go	3.93% <0.00%> (-0.07%)	⬇️
network/server_discovery.go	73.88% <0.00%> (-15.93%)	⬇️

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