Write byte array in Netty ByteBuf

Fixes #1778

(cherry picked from commit 7b4a5ee)

Author: acogoluegnes

src/main/java/com/rabbitmq/client/impl/Frame.java

@@ -215,7 +215,7 @@ public void write(int b) {
 
                 @Override
                 public void write(byte[] b) {
-                    buf.writeBytes(buf);
+                    buf.writeBytes(b);
                 }
 
                 @Override