fixup
avocado: Add functional test suite

Implement the avocado functional tests in python, this
way one can execute them conveniently before sending them
to Travis (this way we use Travis mostly as a double check).

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
.travis.yml: Replace tests with functional suite

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>