[rancid] support for D-Link switches, first stab.....

[Gavin McCullagh]

Hi,

attached to this email are

dllogin
dlrancid

which are modified versions of fnrancid and fnlogin. These work with a
number of the D-Link models which we have here:

# DES-3010F - success (telnet, ssh)
# DES-3052P - success (telnet, ssh, ... a little slow)
# DES-3526 - success (telnet, ssh)
# DES-3550 - success (telnet, ssh)
# DES-3250TG - fail (there's no command to print config)
# DGS-3324SR - success (telnet, ssh)
# DGS-3100 - fail (but probably not too big a job to fix)

This is just a first go, but it's working well enough for us to use now. If
anyone has feedback, I'd love to hear it.

The only other modification was to add

'dlink' => 'dlrancid',

to %vendortable in rancid-fe and then use "dlink" to describe switches in
router.db.

Thanks for rancid, we're already seeing benefits.

Gavin