Make `main()` calls conditional - source_control (#3651)

lib/ansible/modules/extras/source_control/bzr.py

@@ -199,4 +199,6 @@ def main():
 
 # import module snippets
 from ansible.module_utils.basic import *
-main()
+
+if __name__ == '__main__':
+    main()

lib/ansible/modules/extras/source_control/github_hooks.py

@@ -201,4 +201,5 @@ def main():
 from ansible.module_utils.basic import *
 from ansible.module_utils.urls import *
 
-main()
+if __name__ == '__main__':
+    main()