Support Deployment introspection using ProtocolMetadata in the Arquillian Containers

on deploy, the Arquillian Containers should return a ProtocolMetadata object that describes the content of the Deployment.

e.g. Which HTTP contexts (ip/port) are there, which Servlets etc.

This can be used for injection of URL's to the Deployed context, e.g. @ArquillianResource(MyServlet.class) URL url;

The same is used by the ServletProtocol to discover the correct web context to call to invoke the test (this does not currently work at all with AS7)