Revert "Support adding DHCP interfaces one at a time. "

This reverts commit a1b469b10b90b594c256295c140e837726058b87.

This broke testenv deployments - it does not yet work on Ubuntu.

Change-Id: I0f74abc6b99da4b8cabca8ed673c606bae7de0e1
Revert "Add Fedora DHCP interfaces via udev rules."

This reverts commit 201c9e85277dd6083d0cbc6e1318622583c2a082.

This depended on the revert for one-at-a-time.

Change-Id: I05f1f85b8f13a1eea3d5e4b144ff92e0e791bdac