Delete TIM on RSU test

To delete a TIM:

1. Create REST DELETE request containing JSON RSU information in the body
2. Submit the request with the index in the URL /tim?index=5:

3. Verify success:

• HTTP 200 {"deleted_msg":"5"} indicates the message was successfully deleted
• HTTP 400 No message at index 5 indicates there was no message to delete
• HTTP 400 Invalid index -1 indicates the index is out-of-bounds [0,99]
• HTTP 408 Timeout indicates a network error