Added node['docker']['no_proxy'] to complement the existing http_proxy attribute.

[jperville]

Even if little advertised, the docker daemon respects the NO_PROXY environment variable if present.

Setting this variable can be desirable to avoid passing through a proxy, for example when accessing a local docker registry (even more when the docker registry is running on an host that is not reachable from the http proxy such as localhost).

This PR adds a new attribute, node['docker']['no_proxy'] which will be injected in the default docker configuration, exactly like for the node['docker']['http_proxy'] attribute.

[tduffield]

I like it. We'll slate it for the next minor release.

[jperville]

Thank you @tduffield

[boldfield]

Fixes #227

Just wanted to link this PR to an open issue so you don't get any more PRs trying to add this feature.

[tduffield]

Merged into 0.36-stable. Will be released in 0.36.0.