fedora: don't try to use biosdevname if it's not installed

If biosdevname isn't installed it doesn't make sense to try using it
for persistent device names.  Just treat lack of biosdevname as
virtual networking.

plugins/guests/fedora/cap/configure_networks.rb

@@ -17,7 +17,7 @@ module VagrantPlugins
           virtual = false
           interface_names = Array.new
           machine.communicate.sudo("/usr/sbin/biosdevname; echo $?") do |_, result|
-            virtual = true if result.chomp == '4'
+            virtual = true if ['4', '127'].include? result.chomp
           end
 
           if virtual