ISIS: Minor improvements

[codecov-commenter]

Codecov Report

Merging #424 (1cd55b6) into master (6dc5e78) will decrease coverage by 0.07%. The diff coverage is 6.66%.

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@@            Coverage Diff             @@
##           master     #424      +/-   ##
==========================================
- Coverage   54.08%   54.02%   -0.07%     
==========================================
  Files         147      147              
  Lines        7950     7960      +10     
==========================================
  Hits         4300     4300              
- Misses       3445     3455      +10     
  Partials      205      205              

Flag	Coverage Δ
unittests	54.02% <6.66%> (-0.07%)	:arrow_down:

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Impacted Files	Coverage Δ
net/ip.go	93.88% <0.00%> (-4.37%)	:arrow_down:
protocols/isis/server/lsdb.go	0.00% <0.00%> (ø)
protocols/isis/server/lsdb_entry.go	0.00% <0.00%> (ø)
protocols/isis/server/net_ifa_manager.go	0.00% <0.00%> (ø)
protocols/isis/packet/lsp.go	82.19% <100.00%> (ø)

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