Add `gwa routes` or similar to retrieve helpful links

[rustyjux]

As an API provider, I need to get the URLs for my routes so that I can validate my configuration and set up my apps. Especially important for users of the test/training instance since the routes are extended.

Add a new option to gwa status (or a new command entirely) which returns a neat table including links to the following:

• Active Gateway/Namespace (this requires adding routing for manager/namespace/[name])
• Your Products page (/devportal/api-directory/your-products)
• Routes (for gateway services)

Definition of Done:

• New option available for gwa status as per above

[rustyjux]

in 600df72, implemented a stop-gap fix for #100, adding --hosts to gwa status to get host during validation step in quick start process