If managed, give NIC names more room in the details table

Since the engine allows for NIC names up to 15 characters long
(assuming bond+11), we should expand that column so we can see the
entire length. On 80x24, this means we lose the vendor column,
but are able to keep the MAC field, at least.

Change-Id: I2d1591e22da87e6224818f416144ea7de6427c83
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1083106
Signed-off-by: Ryan Barry <rbarry@redhat.com>