[iscsictl] Return discovered targets without login

[asherhiggs at cox.net]

With the old iscsi initiator, it was possible to do a SendTargets 
discovery session only and have discovered targets displayed: 
"iscontrol -dt <target address>". AFAICT the new initiator lacks similar 
functionality and can only do a discovery followed by a login to all 
discovered targets. Am I missing something? If not, is there any plan to 
implement such functionality?