kern/110720: [net] [patch] support for interface descriptions

[Harti Brandt]

Nice feature, although it would be nice to align the maximum length with 
IF-MIB::ifDescr (255 byte + \0). Also I suppose that the field more 
naturally fits into struct if_data (see net/if.h) given the comment for 
that struct:

/*
 * Structure describing information about an interface
 * which may be of interest to management entities.
 */

harti