Handle version upgrades

[tas50]

Right now if you change the version or download URL to a new version nothing happens. We should provide an option to handle the service upgrade.

• test-kitchen suite prepping the previous minor version (1.6.x) then upgrade to the latest one
• the actual option to service upgrade

[aespinosa]

This is how it is done in the docker cookbook https://github.com/chef-cookbooks/docker/blob/master/libraries/docker_service.rb#L99

Will copy this approach

[kubo1060]

How does this look like? I tried 1.9.11 with version property, but im getting checksum mismatch errors.