rolling back to netty 4.1.8

Change-Id: I6dd305780eda38bb1ad6edb32de4d9aeca3d96ea
diff --git a/protocols/openflow/ctl/pom.xml b/protocols/openflow/ctl/pom.xml
index 5de0900..c21b0f6 100644
--- a/protocols/openflow/ctl/pom.xml
+++ b/protocols/openflow/ctl/pom.xml
@@ -115,7 +115,7 @@
                         </Embed-Dependency>
                         <Embed-Transitive>false</Embed-Transitive>
                         <Bundle-NativeCode>
-                            META-INF/native/libnetty_transport_native_epoll_x86_64.so;osname=linux;processor=x86_64,
+                            META-INF/native/libnetty-transport-native-epoll.so;osname=linux;processor=x86_64,
                             *
                         </Bundle-NativeCode>
                         <Import-Package>