packaging: setup: support VLAN  network interfaces

Currently, the network interfaces detected on the system
must be in the form:

<physical>:

This doesn't work for VLAN notations, such as:

eth0.3 or eth0.33@eth0

New implementation updates the pattern for the network
interfaces detection, thus providing support for VLAN
interfaces.

Change-Id: I1a53543671b02dcb9c66a2973ba40d238eb5220f
Bug-Url: https://bugzilla.redhat.com/970971
Signed-off-by: Alex Lourie <alourie@redhat.com>