Shorten ip address lookup timeout

In the CI this completes now in 1m30s, so 3m is long enough to avoid
flaky tests. Locally this takes less than 10 seconds.

.github/workflows/integration.yaml

@@ -69,7 +69,7 @@ jobs:
           source .venv/bin/activate
           ./example test --driver ${{ matrix.driver }} --connection ${{ matrix.connection }} -v &
           vm="$HOME/.vmnet-helper/vms/test"
-          if ! timeout 5m bash -c "until test -f "$vm/ip-address"; do sleep 3; done"; then
+          if ! timeout 3m bash -c "until test -f "$vm/ip-address"; do sleep 3; done"; then
               echo >&2 "Timeout waiting for $vm/ip-address"
               exit 1
           fi

vmnet/vm.py

@@ -83,7 +83,7 @@ def write_command(self, cmd):
         with open(path, "w") as f:
             f.write(data)
 
-    def wait_for_ip_address(self, timeout=300):
+    def wait_for_ip_address(self, timeout=180):
         """
         Lookup the vm ip address in the serial log and write to
         vm_home/ip-address.