Revert "Fedora uses em1 for undercloud/overcloud"

This reverts commit 4380f02f33adbfadb1ef7ee93ff84713766dad1e.

Having trouble with the interface showing up ens4 on Fedora.

Lets revert this along with the associated DIB change until
we get a better solution in place.

Closes-bug: #1298152
Change-Id: Ia71e1d32b93db0c4c844a6dc1ebcd04ab0c13f05
Merge "Revert "Fedora uses em1 for undercloud/overcloud""