Cleanup import for authorized_key

Do not import '*', to ease future refactoring and cleanup of
module_utils.

lib/ansible/modules/system/authorized_key.py

@@ -491,6 +491,7 @@ def main():
     module.exit_json(**results)
 
 # import module snippets
-from ansible.module_utils.basic import *
-from ansible.module_utils.urls import *
+from ansible.module_utils.basic import AnsibleModule
+from ansible.module_utils.urls import fetch_url
+from ansible.module_utils.pycompat24 import get_exception
 main()