callbacks like profile_tasks cause unwanted output

[luto]

If a callback plugin like profile_tasks is enabled in ansible.cfg, the output is shown even without -v:

Wednesday 20 December 2017  10:56:51 +0000 (0:00:00.160)       0:00:00.160 **** 
Wednesday 20 December 2017  10:56:52 +0000 (0:00:00.887)       0:00:01.047 **** 
Wednesday 20 December 2017  10:56:57 +0000 (0:00:04.874)       0:00:05.921 **** 
=============================================================================== 
statuscake_delete_by_tag ------------------------------------------------ 4.87s
Gathering Facts --------------------------------------------------------- 0.89s
Playbook run took 0 days, 0 hours, 0 minutes, 5 seconds

[defaults]
callback_whitelist = profile_tasks,timer

This output should only be shown with -v an above.