container bind ip port should be different then external port

Summary

It is possible to set rundeck_port which is used as port in external address and container bind port.

Steps to reproduce

Try to expose rundeck with nginx on one host.

Expected behavior

rundeck_port should set external ip as it is and rundeck_bind_port should specify port to bind by container. Role should allow also to connect to existing docker network (docker#17 (closed)) and do not expose any port. Also option to allow forward traffic through SSL terminated PROXY should be available.

Actual behavior

Container binds to rundeck_port and external address is set to the same number so it is impossible to use nginx.

Possible fixes

Add new variable rundeck_bind_port with default value 4440.