cmd/dlv: Add ability to connect to headless server
cmd/dlv: Add ability to connect to headless server

Fixes #201. Use to connect to a running headless server

dr2chase/delve,ignatov/delve,firebitsbr/delve,sinuos/delve,visualfc/delve,aarzilli/delve,tylerb/delve,visualfc/delve,waterway/delve,jeffallen/delve,go-delve/delve,dr2chase/delve,dlsniper/delve,go-delve/delve,ggndnn/delve,ignatov/delve,ironcladlou/delve,derekparker/delve,torfuzx/delve,ignatov/delve,jeffallen/delve,go-delve/delve,beni55/delve,aarzilli/delve,w4ngyi/delve,ggndnn/delve,alexbrainman/delve,lukehoban/delve,yigen520/delve,alexbrainman/delve,aarzilli/delve,visualfc/delve,alexbrainman/delve,ironcladlou/delve,go-delve/delve,sinuos/delve,lukehoban/delve,go-delve/delve,tylerb/delve,torfuzx/delve,beni55/delve,waterway/delve,dr2chase/delve,dlsniper/delve,ggndnn/delve,w4ngyi/delve,aarzilli/delve,firebitsbr/delve,dlsniper/delve,derekparker/delve,derekparker/delve,yigen520/delve