[VOL-3143] Optimize and test ofAgent response chunking

Change-Id: Ia48199ea055d1833a116a3ac47c72f09ca78563a
diff --git a/internal/pkg/openflow/connection.go b/internal/pkg/openflow/connection.go
index 209990d..7ad6092 100644
--- a/internal/pkg/openflow/connection.go
+++ b/internal/pkg/openflow/connection.go
@@ -49,6 +49,10 @@
 	events            chan ofcEvent
 	sendChannel       chan Message
 	lastUnsentMessage Message
+
+	flowsChunkSize     int
+	portsChunkSize     int
+	portsDescChunkSize int
 }
 
 func (ofc *OFConnection) peekAtOFHeader(buf []byte) (ofp.IHeader, error) {