Use the networking-l2gw project new location

networking-l2gw and networking-l2gw-tempest-plugin are
imported to new location now and supposed to be retired from
openstack/namespace[1].

-https://review.opendev.org/#/c/744110/

[1] http://lists.openstack.org/pipermail/openstack-discuss/2020-June/015647.html

Change-Id: If00bffe2b6d303686e15060f6b03400ad5a3089f
1 file changed