[rancid] Rancid on F5

[Sam Munzani]

Team,

Latest version of rancid works excellent with F5. However I just noticed 
something. It uses clogin instead of its own f5login script. clogin 
script expects # prompt. If you created an operator account that has 
"bigpipe shell" only instead of full shell, it doesn't give you #.

If we had spin off f5login script separately, we could have accommodated 
bigpipe shell instead of full shell.

My 2 cents.

Sam