feat(router): improve log output.

Add information about the matched host (user application or deis component) and information about the router node.
From their README:

> Please note the Logrus API is not yet stable (pre 1.0), the core API is unlikely change much but please version control your Logrus to make sure you aren't fetching latest master on every build.

I'm fine with keeping on tip, but we may want to consider soft-locking to v0.5.1 in the Dockerfile similar to [docker](https://github.com/docker/docker/blob/master/hack/vendor.sh#L56) and bump as needed. @mboersma/@carmstrong?