kern/64090: remove confusing EDQUOT from routing API

[Bruce M Simpson]

On Fri, Jun 18, 2004 at 01:44:13AM +0000, Bruce M Simpson wrote:
> State-Changed-Why: 
> I see it, and it will probably go away after the ARP rewrite.

Would EADDRINUSE be acceptable in the meantime? None of the network
code *relies* on seeing EDQUOT, and EADDRINUSE has the most useful
human-readable error message here for the case mentioned in the PR.

BMS