Update dest service with a different tls identity strategy (#1215)

* Update dest service with a different tls identity strategy
* Send controller namespace as separate field

Signed-off-by: Kevin Lingerfelt <kl@buoyant.io>

proxy/src/transport/tls/identity.rs

@@ -37,6 +37,9 @@ impl Identity {
                 };
                 Self::try_from_pod_name(&namespaces, &i.pod_name).map(Some)
             },
+            Some(Strategy::K8sPodIdentity(_i)) => {
+                Ok(None) // TODO: switch to K8sPodIdentity
+            },
             None => Ok(None), // No TLS.
         }
     }