Replace wait-for-network services with retries

tests/integration/rostest/test_18_network_on_boot.py

@@ -0,0 +1,26 @@
+import pytest
+import rostest.util as u
+from rostest.util import SSH
+
+pytestmark = pytest.mark.skipif(u.arch != 'amd64', reason='amd64 network setup impossible to replicate for arm64')
+
+cloud_config_path = './tests/integration/assets/test_18/cloud-config.yml'
+
+net_args_arch = {'amd64': ['-net', 'nic,vlan=1,model=virtio'],
+                 'arm64': ['-device', 'virtio-net-device']}
+net_args_arch['arm'] = net_args_arch['arm64']
+net_args = net_args_arch[u.arch]
+
+
+@pytest.fixture(scope="module")
+def qemu(request):
+    q = u.run_qemu(request,
+                   run_args=['--cloud-config', cloud_config_path] +
+                   net_args + net_args + net_args)
+    u.flush_out(q.stdout)
+    return q
+
+
+def test_network_resources_loaded(qemu):
+    SSH(qemu).check_call("apt-get --version")
+    SSH(qemu).check_call("sudo system-docker images | grep tianon/true")