Bump gRPC version to 1.0.0 GA

Change-Id: If4220ab94394639e356ef7fca46936a28644cd73
diff --git a/incubator/rpc-grpc/pom.xml b/incubator/rpc-grpc/pom.xml
index 832ac73..61e01c8f 100644
--- a/incubator/rpc-grpc/pom.xml
+++ b/incubator/rpc-grpc/pom.xml
@@ -37,7 +37,7 @@
             org.onosproject.incubator.grpc
         </onos.app.requires>
         <protobuf.version>3.0.0</protobuf.version>
-        <grpc.version>1.0.0-pre2</grpc.version>
+        <grpc.version>1.0.0</grpc.version>
         <grpc.netty.version>4.1.3.Final</grpc.netty.version>
     </properties>