Configure builder servers from file
Configure builder servers from file

* sessionsrv, builder-api, and vault all configurable by file
* Retrieve detailed version from plan for builder services
* Move plans to a more appropriate location for builder services
* Remove config template from builder services plan's

Pull request: #456
Approved by: metadave

habitat-sh/habitat,rsertelon/habitat,rsertelon/habitat,habitat-sh/habitat,rsertelon/habitat,rsertelon/habitat,habitat-sh/habitat,habitat-sh/habitat,rsertelon/habitat,rsertelon/habitat,habitat-sh/habitat,habitat-sh/habitat,rsertelon/habitat,habitat-sh/habitat,habitat-sh/habitat