Update the example port to the new official Docker port.
Rename docker_daemon_ip1 to public_node_ip for clarity.
Remove duplicated join commands.
remove go install and use go get -u

Signed-off-by: Victor Vieux <vieux@docker.com>
update node_ip

Signed-off-by: Victor Vieux <vieux@docker.com>
Merge pull request #159 from docker/improve-readme-consistency

Improve readme consistency