Comment out call to Service.exists

This functionality from pytest-testinfra is currently broken.  See
pytest-dev/pytest-testinfra#757 for more details.  Once
pytest-dev/pytest-testinfra#754 has been merged and a new release of
pytest-testinfra is created the Service.exists line can be restored.

molecule/default/tests/test_default.py

@@ -32,6 +32,11 @@ def test_symlink(host):
 
 def test_services(host):
     """Verify that the expected services are present."""
-    s = host.service("systemd-resolved.service")
-    assert s.exists, "systemd-resolved.service does not exist."
-    assert s.is_enabled, "systemd-resolved.service is not enabled."
+    s = host.service("systemd-resolved")
+    # This assertion currently fails because of
+    # pytest-dev/pytest-testinfra#757.  Once
+    # pytest-dev/pytest-testinfra#754 has been merged and a new
+    # release is created the following line can be uncommented.
+    # assert s.exists, "systemd-resolved service does not exist."
+    assert s.is_enabled, "systemd-resolved service is not enabled."
+    assert s.is_running, "systemd-resolved service is not running."