Previously, this function executed the same test as
test_bots.py/test_create_embedded_bot_with_incorrect_service_name().
Now, instead of testing to add an embedded bot with an incorrect service
name, we test messaging an embedded bot with an incorrect service
name.
External bots may call bot_handler.quit() when
they wish to terminate, e.g. due to a misconfiguration.
Currently, embedded bots ignore calls to quit(), even
though they signal a problem. This commit does the first
step in handling quit() calls by logging a warning.