Support https when testing ODL

Support https when testing ODL

It conforms with the last change on ODL tests [1].
Neutron endpoint is passed via robot args instead of Neutron ip.
Keystone url (based on OS_AUTH_URL) is passed too to replace Keystone
ip.

[1] https://git.opendaylight.org/gerrit/#/c/63293/

Conflicts:
    docker/restapi/Dockerfile
    docker/smoke/Dockerfile

Change-Id: Ie44f55304a438b1b0289ec69ac2241664be70e80
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
(cherry picked from commit dd99f5356ef08f3a2a1ed18d63492391390df752)