[rancid] Infinate loop on clogin

[Sutherland, James]

Interestingly we managed to accidentally get rancid set so that an
Efficient 5871 was set as a cisco.

What resulted was an infinite loop that causes rancid to hang forever
until the telnet to that device is killed.

I wasn't sure if this would be considered a bug, but I thought I'd send
it to this list as an example of this problem, which we've seen several
times.

Example:
Fri 8:58am {rancid at prometheus:[~/bin]} ./clogin 172.28.41.69
172.28.41.69
spawn telnet 172.28.41.69
Trying 172.28.41.69...
Connected to 172.28.41.69.
Escape character is '^]'.

Efficient 5871 IDSL Router (5871-001/2) v5.3.80 Ready
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^C
Fri 8:58am {rancid at prometheus:[~/bin]}