[c-nsp] MD5 checksums for IOS images

[Phil Mayers]

>
>This file can be found at http://www.cisco.com/web/tsweb/psirt/cisco-sr-20080516-rootkits.zip and contains

Wow. Very nearly all IOS images; it's lacking very recent ones.

That's probably one of the most useful links I've ever seen to the cisco 
web page.

Shame their web server doesn't properly set ETag/Last-Modified headers 
so a friendly script could non-aggressively pull it repeatedly.

One assumes they'll be updating this as time goes forward?