Some enhancements for documented steps running hub services on Ubuntu 16.04

[losdevnull]

I tried to follow the steps and were able to successfully have hub services up and running in a Ubuntu 16.04 box. There are some problems that I encountered so some enhancement in the documentation would be expected.

1. apt-get installl docker-compose might give us an old version of docker compose that is not compatible with the docker-compose.yml provide. We'd update the instruction to install latest docker-compose from binary.
2. The command for finding local IP MY_IP could be problematic since some systems could have addr: prefix before the actual IP address (see below as example). Better to handle that explicitly.

# ifconfig | grep 'inet '
          inet addr:172.18.0.1  Bcast:172.18.255.255  Mask:255.255.0.0
          inet addr:10.42.0.1  Bcast:0.0.0.0  Mask:255.255.255.0
          inet addr:172.17.0.1  Bcast:172.17.255.255  Mask:255.255.0.0
          inet addr:9.42.17.33  Bcast:9.42.17.255  Mask:255.255.255.0
          inet addr:10.42.0.0  Bcast:10.42.0.0  Mask:255.255.255.255
          inet addr:127.0.0.1  Mask:255.0.0.0