Added the schema.SchemaService endpoint to the proxy to support
chameleon schema queries.

Change-Id: I9b3e1b6b6165d5fe6d3e38593a70ded90e707385
diff --git a/envoy/front-proxy/voltha-grpc-proxy.template.json b/envoy/front-proxy/voltha-grpc-proxy.template.json
index 8a83155..469ab18 100644
--- a/envoy/front-proxy/voltha-grpc-proxy.template.json
+++ b/envoy/front-proxy/voltha-grpc-proxy.template.json
@@ -34,6 +34,11 @@
                       "timeout_ms": 0,
 		      "prefix": "/voltha.",
                       "cluster": "voltha-grpc"
+                    },
+                    {
+                      "timeout_ms": 0,
+		      "prefix": "/schema.SchemaService",
+                      "cluster": "voltha-grpc"
                     }
                   ]
                 }