Fix instance ip4 network stopping (nat)

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

src/aleph/vm/pool.py

@@ -81,7 +81,11 @@ def setup(self) -> None:
     def teardown(self) -> None:
         """Stop the VM pool and the network properly."""
         if self.network:
-            self.network.teardown()
+            # self.network.teardown()
+            # FIXME Temporary disable tearing down the network
+            # Fix issue of persistent instances running inside systemd controller losing their ipv4 nat access
+            #  upon supervisor restart or upgrade.
+            pass
 
     async def create_a_vm(
         self, vm_hash: ItemHash, message: ExecutableContent, original: ExecutableContent, persistent: bool