Fix instance ip4 network stopping (nat)

[olethanh]

Temporary disable tearing down the network when stopping supervisor Fix issue of persistent instances running inside systemd controller losing their ipv4 Nat access upon supervisor restart or upgrade.

Github issue aleph-im/support#9

this is a temporary hotfix till we have a better solution for handling the network

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 62.89%. Comparing base (76c6897) to head (3b2e938).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aleph/vm/pool.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #742   +/-   ##
=======================================
  Coverage   62.89%   62.89%           
=======================================
  Files          71       71           
  Lines        6352     6352           
  Branches      519      519           
=======================================
  Hits         3995     3995           
  Misses       2197     2197           
  Partials      160      160           

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