Skip systemctl functional tests when systemd is not running

Change-Id: I4c1b61ebf34d8df4e53799151f33465096f33f79

.pre-commit-config.yaml

@@ -52,7 +52,7 @@ repos:
     hooks:
       - id: pylint
         name: pylint
-        entry: pylint --max-line-length=88 -E -e W,E -d unused-import,broad-except,fixme,unspecified-encoding,redundant-u-string-prefix
+        entry: .tox/pep8/bin/pylint --max-line-length=88 -E -e W,E -d unused-import,broad-except,fixme,unspecified-encoding,redundant-u-string-prefix
         files: ^tobiko/
         language: system
         types: [python]

tobiko/tests/functional/shell/test_systemctl.py

@@ -25,9 +25,9 @@ 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}")
+            sh.execute('pgrep systemd')
+        except sh.ShellCommandFailed:
+            self.skipTest("systemd is not running")
 
     def test_list_system_services(self):
         units = sh.list_systemd_units()

zuul.d/docker.yaml

@@ -47,7 +47,7 @@
     name: tobiko-docker-infrared
     description: |
       Run functional tests for an OpenStack Python project inside a Docker container.
-    voting: false
+    voting: true
     parent: tobiko-docker-unit
     timeout: 3600
     vars: