Update protocol to 2.0 draft.

proto @ 9f145f80

-Subproject commit 33b132bffaabacbd003eec41b498d2810f386161
+Subproject commit 9f145f80342f5cd28e5764b302d7e2e33bd00891

docs/en/protocols/README.md

@@ -23,7 +23,7 @@ service ID.
 ### Language based native agent protocol
 This protocol is combined from two parts:
 * [Cross Process Propagation Headers Protocol](Skywalking-Cross-Process-Propagation-Headers-Protocol-v1.md) is for in-wire propagation.
-which is usually used to carrier the necessary info to build trace.
+By following this protocol, the trace segments in different processes could be linked.
 * [SkyWalking Trace Data Protocol](Trace-Data-Protocol.md) define the communication way and format between agent and backend.
 
 

docs/en/protocols/Trace-Data-Protocol.md

@@ -111,8 +111,9 @@ Input：
 
 
 ## Deprecated services
-**Deprecated service**(s) are the gRPC service name SkyWalking used before. In SkyWalking v6, in order to match the common 
-concepts in CloudNative world. There services are still supported at this moment, but it will be removed at Feb. 2019.
+**Deprecated service**(s) are the gRPC services SkyWalking used before. In SkyWalking v6, in order to match the common 
+concepts in CloudNative world, these services are deprecated. 
+Although there services are still supported at this moment, but it will be removed after 6 months later(Feb. 2019).
 
 ## ~~Application Register Service~~
 **Deprecated service** 

oap-server/server-receiver-plugin/skywalking-istio-telemetry-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/istio/telemetry/provider/IstioTelemetryGRPCHandler.java

@@ -27,7 +27,7 @@ import io.istio.api.policy.v1beta1.TypeProto;
 import java.time.Duration;
 import java.time.Instant;
 import java.util.Map;
-import org.apache.skywalking.apm.network.servicemesh.DetectPoint;
+import org.apache.skywalking.apm.network.common.DetectPoint;
 import org.apache.skywalking.apm.network.servicemesh.Protocol;
 import org.apache.skywalking.apm.network.servicemesh.ServiceMeshMetric;
 import org.slf4j.Logger;