v1.6.2

• add support turn on/off a service from adding to haproxy, which is useful for blue/green testing.

e.g. Imagine you have a service called blue, and another called green and both are load balanced by dockercloud haproxy. You can do the following to remove the green service,

docker service update --label-add "com.docker.dockercloud.haproxy.deactivate=true" green

and run the following command to add it back

docker service update --label-add "com.docker.dockercloud.haproxy.deactivate=false" green