allocator: use ip-only permissions and port-bindings

[ernado]

Fix #34
Relates #33

[codecov]

Codecov Report

Merging #35 into master will decrease coverage by 0.05%.
The diff coverage is 80.76%.

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
- Coverage    73.5%   73.44%   -0.06%     
==========================================
  Files          21       21              
  Lines        1638     1672      +34     
==========================================
+ Hits         1204     1228      +24     
- Misses        310      315       +5     
- Partials      124      129       +5

Impacted Files	Coverage Δ
internal/allocator/allocation.go	78.94% <70%> (-5.91%)	⬇️
internal/allocator/allocator.go	81.7% <82.35%> (-0.57%)	⬇️

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