netty: Bump Netty dependency to 4.1.1.Final

Bumping tcnative was not required to be done at the same time as Netty.
But the new tcnative should now work correctly on Windows and be smaller
on Linux.
diff --git a/build.gradle b/build.gradle
index 53acda9..808d061 100644
--- a/build.gradle
+++ b/build.gradle
@@ -142,9 +142,9 @@
                 protobuf_plugin: 'com.google.protobuf:protobuf-gradle-plugin:0.7.7',
                 protobuf_util: "com.google.protobuf:protobuf-java-util:${protobufVersion}",
 
-                netty: 'io.netty:netty-codec-http2:[4.1.0.Final]',
-                netty_epoll: 'io.netty:netty-transport-native-epoll:4.1.0.Final' + epoll_suffix,
-                netty_tcnative: 'io.netty:netty-tcnative-boringssl-static:1.1.33.Fork15:' + osdetector.classifier,
+                netty: 'io.netty:netty-codec-http2:[4.1.1.Final]',
+                netty_epoll: 'io.netty:netty-transport-native-epoll:4.1.1.Final' + epoll_suffix,
+                netty_tcnative: 'io.netty:netty-tcnative-boringssl-static:1.1.33.Fork17:' + osdetector.classifier,
 
                 // Test dependencies.
                 junit: 'junit:junit:4.11',