Add "VXLAN" to check-config.sh

Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>

contrib/check-config.sh

@@ -241,6 +241,12 @@ if ! is_set EXT4_FS || ! is_set EXT4_FS_POSIX_ACL || ! is_set EXT4_FS_SECURITY;
 	echo "    $(wrap_color 'enable these ext4 configs if you are using ext4 as backing filesystem' bold black)"
 fi
 
+echo '- Network Drivers:'
+{
+	echo '- "'$(wrap_color 'overlay' blue)'":'
+	check_flags VXLAN | sed 's/^/  /'
+} | sed 's/^/  /'
+
 echo '- Storage Drivers:'
 {
 	echo '- "'$(wrap_color 'aufs' blue)'":'