Ignore interfaces with invalid VLAN IDs.

There are some special cases of interface names where something follows
the VLAN ID, such as -fcoe. We can't interact with these via
NetworkManager so return nothing instead of raising a ValueError, which
will cause SettingsNotFound to be raised instead.

Resolves: rhbz#1274893

pyanaconda/nm.py

@@ -634,7 +634,16 @@ def _device_settings(name):
         if not settings:
             # connections generated by NM from iBFT
             _parent, _sep, vlanid = name.partition(".")
-            settings = _find_settings(int(vlanid), 'vlan', 'id')
+
+            # If we are not able to convert the VLAN id to an int this
+            # is probably a FCoE interface and we're not going to be able
+            # to do much with it.
+            try:
+                vlanid = int(vlanid)
+            except ValueError:
+                return []
+
+            settings = _find_settings(vlanid, 'vlan', 'id')
     else:
         settings = _find_settings(name, 'connection', 'interface-name')
         if not settings: