Merge branch 'release_3.1.3' into devel

* release_3.1.3:
  create .lock file without needing the proj dir to exist
  work around a change in ansible 2.3 to `Task.get_name()`
  mock message obect in callback receiver test

awx/main/models/projects.py

@@ -205,7 +205,11 @@ class ProjectOptions(models.Model):
         return sorted(results, key=lambda x: smart_str(x).lower())
 
     def get_lock_file(self):
-        proj_path = self.get_project_path()
+        '''
+        We want the project path in name only, we don't care if it exists or
+        not. This method will just append .lock onto the full directory path.
+        '''
+        proj_path = self.get_project_path(check_if_exists=False)
         if not proj_path:
             return None
         return proj_path + '.lock'