Drawbridge download asks for stack info again even when passed in the command

[varun217]

drawbridge download 1 host-a1:/home/vxxx/test.log /Users/vmehrotr/Sign

prompts for a config index, even though its already passed on the commandline

As per our discussion, it looks related to this function somehow: https://github.com/AnalogJ/drawbridge/blob/master/cmd/drawbridge/drawbridge.go#L326-L331