Phase 1 regression tests + quick guides examples

* Added phase 1 regression tests.
    + Each test has its own .README file describing topology,
    test scenario and other useful info
    + Some tests do not work well with NetworkManager or/and
    with older distros
    + Test virtual_bridge_2_vlans_over_round_robin is currently
    broken for unknown reason
* Added quick guides examples
    + Added some examples from wiki pages

Signed-off-by: Jiri Prochazka <jprochaz@redhat.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>