[rancid] rancid support for Brocade Fabric OS

[Elliot Wilen]

Comparing Howard's version of the script to mine, I see a few differences, one of which may be a modification I made. Instead of using configShow directly, my script uses configUpload -all and saves it to a local file on the switch, followed by configShow -l to display that file. I think this yields a more complete configuration similar to what one would use to back up the switch via ftp.

His version also has a couple additions relative to whatever the common source was.