Modularity Testing Framwork tests according to standard test interface

[Stef Walter]

I added an example for Modularity Testing Framework tests, and how they
would be invoked in the standard way:

https://fedoraproject.org/wiki/Changes/InvokingTestsAnsible#Example:_Modu...

The example is here right now, but I believe it's ready to be included
in dist-git modules/haproxy for real:

https://github.com/stefwalter/haproxy-dist-git/tree/ansible-test

There is some additional roles in the roles/avocado and roles/repo
directory. This would be combined with the standard-test-roles stuff
that Merlin is packaging up.

Cheers,

Stef