tests/integration/test_ethernet.py is a script capable of using the network
module without executing it from Ansible and using Pytest. The example test
sets an ip in a test interface. The changes in tox.ini adapt the testing to the
new script. The __init__.py files were added to allow python2.7 compatibility.
Signed-off-by: Elvira García Ruiz <elviragr@riseup.net>
