[ONOS-7829] Implement AbstractGrpcClient and AbstractGrpcClientControl

Change-Id: I39cba6834e7fe8d1b60b576b9934c0b3cfa7104b
diff --git a/protocols/grpc/ctl/BUILD b/protocols/grpc/ctl/BUILD
index 20c7ab8..ac0703d 100644
--- a/protocols/grpc/ctl/BUILD
+++ b/protocols/grpc/ctl/BUILD
@@ -2,6 +2,7 @@
     "//protocols/grpc/api:onos-protocols-grpc-api",
     "//protocols/grpc/proto:onos-protocols-grpc-proto",
     "@io_grpc_grpc_java//core",
+    "@io_grpc_grpc_java//netty",
 ]
 
 osgi_jar(