Revert "Disable networking-l2gw in scenario004"
Revert "Disable networking-l2gw in scenario004"

This reverts commit 06ed08b59a63fd8022af6ef9f0ca3bc789415643.

Reason for revert:
The original problem was resolved by the dependent patch.

Depends-on: https://review.opendev.org/c/x/networking-l2gw/+/845141
Related-Bug: #1977980
Change-Id: I1b44921b87c98e8f98e6f308702dce9c991c12ae

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration