Single hub needs a way to identify its external host/port info

[Exide]

Given this configuration (defaults and what our CI uses):

app.url = http://localhost/
http.bind_port = 80

rzander@host$ docker ps -a
CONTAINER ID        IMAGE                    COMMAND                  CREATED          STATUS           PORTS                  NAMES
d20dd74beced        flightstats/hub:latest   "/bin/bash /opt/hu..."   1 second ago     Up 1 second      0.0.0.0:8081->80/tcp   hub

root@container$ hostname
d20dd74beced

What we get from the current helper methods is this:

• HubHost.getLocalHttpNameUri returns http://d20dd74beced:80/
• HubHost.getLocalHttpIpUri returns http://172.17.0.2:80
• HubProperties.getAppUrl returns http://localhost/

However what we need is either of these:

http://127.0.0.1:8081

http://localhost:8081