Skip test when systemctl command is not available

Change-Id: Iaff083085b460723f0100725fcda97f742bae84a

tobiko/tests/functional/shell/test_systemctl.py

@@ -22,6 +22,13 @@ from tobiko.shell import sh
 
 class TestSystemctl(testtools.TestCase):
 
+    def setUp(self):
+        super().setUp()
+        try:
+            sh.execute('systemctl --version')
+        except sh.ShellCommandFailed as ex:
+            self.skipTest(f"Can't execute systemctl: {ex.stderr}")
+
     def test_list_system_services(self):
         units = sh.list_systemd_units()
         self.assertNotEqual([], units)

zuul.d/docker.yaml

@@ -8,9 +8,7 @@
       jobs:
         - tobiko-docker-unit
         - tobiko-docker-functional
-    gate:
-      jobs:
-        - tobiko-docker-unit
+    gate: *CHECK
     periodic: *CHECK
 
 
@@ -34,7 +32,7 @@
     name: tobiko-docker-functional
     description: |
       Run functional tests for an OpenStack Python project inside a Docker container.
-    voting: false
+    voting: true
     parent: tobiko-docker-unit
     timeout: 3600
     vars: