Decouple Iptables utility from from kill switch feature

[Waldz]

Updates: #1597

[codecov-io]

Codecov Report

Merging #1602 into master will decrease coverage by 0.01%.
The diff coverage is 76.92%.

@@            Coverage Diff             @@
##           master    #1602      +/-   ##
==========================================
- Coverage   47.75%   47.74%   -0.02%     
==========================================
  Files         288      288              
  Lines       11509    11478      -31     
==========================================
- Hits         5496     5480      -16     
+ Misses       5619     5606      -13     
+ Partials      394      392       -2

Impacted Files	Coverage Δ
session/pingpong/factory.go	0% <ø> (ø)	⬆️
session/pingpong/invoice_storage.go	93.47% <ø> (+18.85%)	⬆️
mobile/mysterium/entrypoint.go	0% <0%> (ø)	⬆️
tequilapi/api_test_utils.go	86.66% <100%> (ø)	⬆️
session/pingpong/exchange_message_tracker.go	90.21% <100%> (+1.1%)	⬆️
tequilapi/sse/sse.go	71.11% <0%> (-3.34%)	⬇️
core/promise/methods/noop/dialog_mock.go	71.87% <0%> (+3.12%)	⬆️

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