Fix DHCP hostname being overwritten

tests/integration/rostest/test_12_dhcp_hostname.py

@@ -0,0 +1,21 @@
+import pytest
+import rostest.util as u
+from rostest.util import SSH
+
+ssh_command = ['./scripts/ssh', '--qemu', '--key', './tests/integration/assets/test.key']
+cloud_config_path = './tests/integration/assets/test_12/cloud-config.yml'
+
+
+@pytest.fixture(scope="module")
+def qemu(request):
+    q = u.run_qemu(request, ['--cloud-config', cloud_config_path])
+    u.flush_out(q.stdout)
+    return q
+
+
+@pytest.mark.timeout(40)
+def test_dhcp_hostname(qemu):
+    SSH(qemu, ssh_command).check_call('''
+hostname | grep rancher-dev
+cat /etc/hosts | grep rancher-dev
+    ''')