:read-resource operation of jax-rs subsystem doesn't handle all interfaces

:read-resource operation of jax-rs subsystem doesn't handle interfaces, where end-point path is defined on interface

Steps to reproduce:

1. @Path("pure/proxy")
   public interface PureProxyApiService {
       @Path("test/{a}/{b}")
       @GET
       String test(@PathParam("a") String a, @PathParam("b") String b);
   }
   public class PureProxyEndPoint implements PureProxyApiService {
       @Override
       public String test(@PathParam("a") String a, @PathParam("b") String b) {
           return a + b;
       }
   }
   

2. /deployment=DEPLOYMENT_NAME/subsystem=jaxrs:read-resource(recursive,include-runtime)
3. Output:

           "org.resteasy.simple.deployment.PureProxyEndPoint" => {
               "resource-class" => "org.resteasy.simple.deployment.PureProxyEndPoint",
               "rest-resource-paths" => undefined,
               "sub-resource-locators" => undefined
           }
   

4. If class has @Path annotation, read-resource operation works correctly

5. public interface ProxyApiService {
       @Path("test/{a}/{b}")
       @GET
       String test(@PathParam("a") String a, @PathParam("b") String b);
   }
   @Path("proxy")
   public class ProxyEndPoint implements ProxyApiService {
       @Override
       public String test(@PathParam("a") String a, @PathParam("b") String b) {
           return a + b;
       }
   }
   

6.         "org.resteasy.simple.deployment.ProxyEndPoint" => {
               "resource-class" => "org.resteasy.simple.deployment.ProxyEndPoint",
               "rest-resource-paths" => [{
                   "resource-path" => "proxy/test/{a}/{b}",
                   "consumes" => undefined,
                   "produces" => undefined,
                   "java-method" => "java.lang.String org.resteasy.simple.deployment.ProxyEndPoint.test(@PathParam java.lang.String a, @PathParam java.lang.String b)",
                   "resource-methods" => ["GET /jaxrs-wf/proxy/test/{a}/{b}"]
               }],
               "sub-resource-locators" => undefined
           }
   

cc rhn-engineering-lgao