Push upstream reachability tests

Push upstream reachability tests

They simply get the complete lists of neutron resources (networks,
subnets and ports). They highlight issues to reach ODL urls without
interpreting the other test results.

This is the last robot file currently hosted by OPNFV. It follows the
previous commits [1] and [2].

[1] https://git.opendaylight.org/gerrit/#/c/40948/
[2] https://git.opendaylight.org/gerrit/#/c/46749/

Change-Id: I45f69fca9fdb17eaedcebc368c58051639a0480d
Signed-off-by: Cédric Ollivier <ollivier.cedric@gmail.com>