Configures the tap-as-a-service neutron plugin

Adds the needed changes and configurations in
order to use the neutron plugin, tap-as-a-service,
to create port mirrors using `openstack tap` commands.

Implements: configure-taas-plugin
Depends-On: https://review.opendev.org/c/openstack/kolla/+/885151


Change-Id: Ia09e1f8b423d43c0466fe2d6605ce383fd813544
Signed-off-by: Juan Pablo Suazo <jsuazo@whitestack.com>