Allow specifying an existing listener

[darrenmartyn]

It would be nice to be able to specify an existing Empire listener instead of having one spun up at launch.

I'm not entirely sure if this will break other things though?

[keldnorman]

try this...

IP=$(docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $(docker ps|grep "bcsecurity/empire"|awk '{print $1}'))
docker run --rm -it byt3bl33d3r/deathstar -u YourUserHere -p YourPasswordHere--api-host ${IP}