There's a better maintained trinity test at:

   https://github.com/avocado-framework-tests/avocado-misc-tests/blob/master/fuzz/trinity.py

Let's drop this outdated example.

Reference: https://github.com/avocado-framework/avocado/issues/2285
Reference: https://trello.com/c/uCcng8dN/1168-drop-trinity-example-testSigned-off-by: NCleber Rosa <crosa@redhat.com>