netty4 OpenFlow southbound

- separate I/O thread and message dispatch threads

Change-Id: I11a10a47de451a9e3063b62f9450be19c3a9dae7
diff --git a/protocols/openflow/api/BUCK b/protocols/openflow/api/BUCK
index 0af0b23..c371a02 100644
--- a/protocols/openflow/api/BUCK
+++ b/protocols/openflow/api/BUCK
@@ -1,6 +1,7 @@
 COMPILE_DEPS = [
     '//lib:CORE_DEPS',
     '//lib:openflowj',
+    '//lib:netty-transport',
 ]
 
 TEST_DEPS = [