Redefine ``configure_vlan_transparent`` method again

In [1], the method ``configure_vlan_transparent`` was renamed. Some
dependant projects, like whitebox-neutron-tempest-plugin, use this
method. Also the concept of "inner VLAN" does not exist in the VLAN
transparency feature.

[1]https://review.opendev.org/c/openstack/neutron-tempest-plugin/+/937778

Closes-Bug: #2100270
Change-Id: Ib3511c5d2d30ab9de60e4dfaa7035dc937a9f609
1 file changed