Bug#538433: Obsolete ifconfig and related tools

[Jan Engelhardt]

>Oh, sorry I missed the patch at first. But it is not a good idea to
>inject text on standard output, since these tools are usually used
>inside scripts..

If need be, the printing to stdout can be changed to stderr.

Not that grepping in ifconfig output was reliable in the first place
(due to localization, you name it)...