systemd: Start inactive units for reload/restart

The `service` module starts services that are not running when
`action=restarted` or `action=reloaded`, which is especially convenient
for initial deployments because it eliminates an extraneous operation
for when the service starts for the first time. This commit adjusts the
behavior of the `systemd` module to match.

lib/ansible/modules/system/systemd.py

@@ -383,6 +383,9 @@ def main():
             elif module.params['state'] == 'stopped':
                 if result['status']['ActiveState'] == 'active':
                     action = 'stop'
+            else:
+                if result['status']['ActiveState'] != 'active':
+                    action = 'start'
                 else:
                     action = module.params['state'][:-2] # remove 'ed' from restarted/reloaded
                 result['state'] = 'started'