Add a default 'localhost' deploy mode

[zacharlie]

For local testing and development it may be useful to have a deployment mode which automatically configures everything with sensible defaults and assumes the use of localhost or 127.0.0.1, uses self signed certificates, and otherwise makes it easy to dry-run everything without stepping through tons of config steps, e.g. make osgs-demo.

Will be great to have this available for integration tests as well.