fix route -6 output

Signed-off-by: Lehner Florian <dev@der-flo.net>

hi!

Currently 'route -6' doesn't fit into a line of 80 characters. In addition the length of $addr6 and $naddr6 differs.

The following gist shows two outputs of 'route -6': https://gist.github.com/florianl/8269072
In the first output you can see, how it looks like at the moment. The following output displays how it could look like using the attached patch.

with kind regards,
 Florian