This patch cleary enables a `neutron plugin` for the functional test
of `tacker-functional-devstack-multinode-sol-kubernetes` in zuul.
[1] is fixed in the Octavia on the assumption that using a `octavia
create_network_interface_device` function[2] of the Neutron.
According to [1], if using the Octavia, it seems that the
`neutron plugin` needs to be clearly define.
Also currentry the functional test of
`tacker-functional-devstack-multinode-sol-kubernetes` is not became
`-1` status on zuul when zuul's result even is `RETRY_LIMIT` because
job's voting is `non-vorting`. So this patch changes from
`non-voting` to `voting` in zuul's job results.
[1] 651f095a81
[2] https://github.com/openstack/neutron/blob/master/devstack/lib/octavia#L7-L28
Closes-Bug: 1919396
Change-Id: I999a2c7c06528c7470cec2161bdd361a67a8da6f
ee97db7c52