[rancid] tweaking request

[Majed]

Peace, from time to time, we have congestions on links to cisco devices
and so when rancid trying to connect, it gets cut off, so what is
needed is the following: if rancid encounters "authorization failed",
let it try encore until no such error occurs!

sample of the nuicance:

- !Interface: GigabitEthernet0/0, PLATFORM SGMII INTERFACE
- !Interface: GigabitEthernet0/1, PLATFORM SGMII INTERFACE
- !Interface: GigabitEthernet0/1, Backplane CN Gigabit Ethernet, 
+ !DEBUG: % Authorization failed.
+ !