Added rancid Cisco PoE control dev file

[sjthespian]

#27

I threw together a quick-n-dirty dev file to support using rancid (http://www.shrubbery.net/rancid/) for controlling devices using PoE on Cisco switches. I've needed to power-cycle too many of my cameras and PoE Raspberry Pis, and got tired of doing it by hand!

It's not the most elegant thing I have ever written, but it works for me. This could all be done via. direct ssh/telnet to the Cisco device, but I figured I would let rancid take care of the connection negotiation just to keep it simpler.

It should be straight forward to adapt this for any other managed switch that supports PoE and rancid.

[garlick]

Thanks - this will also need to be added to the Makefile.am so that it becomes part of the dist tarball. You can just tack that on as a second commit if you like.

[sjthespian]

@garlick done.

[garlick]

Thanks very much!