Remove the license text from files inside docs, examples and selftest,
to keep the license text only in relevant parts of the project.

References:

* https://fedoraproject.org/wiki/Packaging:LicensingGuidelines
* https://www.gnu.org/licenses/gpl-howto.htmlSigned-off-by: NRudá Moura <rmoura@redhat.com>

Usually coverage and xunit are unused and only slows down CI. This patch
disables it by default. In order to get coverage please run
`selftest/coverageall`.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

In order for people to run all avocado tests at once,
move and reorganize tests under a directory called
selftests. For someone to run all self tests in
avocado, one would have to execute:

    selftests/run selftests/all

This is a shortcut for developers. .travis.yml
was also updated to run tests based on the new
directory structure.
Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>

I went through all python files in avocado code, and
some changes were made:

* Files entirely written by the current avocado dev
team were changed to be GPL v2+
* Files with a significant portion of code derived
from autotest remain GPL v2 strict, and original
authorship was re-established
Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>

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

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