title: "Swagger: skipping unknown type" messages when using Composer REST Server
body: <p>When starting the Composer REST Server , there are multiple lines that state "Swagger: skipping unknown type" before the server is started.</p>
  
  <pre><code>Discovering types from business network definition ...
  Discovered types from business network definition
  Generating schemas for all types in business network definition ...
  Generated schemas for all types in business network definition
  Adding schemas for all types to Loopback ...
  Swagger: skipping unknown type "RegionCode".
  Swagger: skipping unknown type "RegionCode".
  Swagger: skipping unknown type "RegionCode".
  Swagger: skipping unknown type "RegionCode".
  Swagger: skipping unknown type "Type".
  Swagger: skipping unknown type "Country".
  Swagger: skipping unknown type "Status".
  Swagger: skipping unknown type "JobType".
  Swagger: skipping unknown type "CarType".
  Swagger: skipping unknown type "Type".
  Swagger: skipping unknown type "Country".
  </code></pre>
  
  <p>It looks like the concepts are being skipped when generating is done, although I am not sure why there are multiple skipping for the same concept.
  Is this by design?</p>