a48e5c7 merge build failure

Motivation:
a48e5c7 from 4.1 introduced a build failure when merged to master.

Modifications:
- Resolve build failures due to interface changes.

Result:
Build now compiles.

Author: Scottmitch

transport-sctp/src/main/java/io/netty/channel/sctp/SctpChannelOption.java

@@ -20,6 +20,8 @@
 
 import java.net.SocketAddress;
 
+import static io.netty.channel.ChannelOption.valueOf;
+
 /**
  * Option for configuring the SCTP transport
  */

transport-udt/src/main/java/io/netty/channel/udt/UdtChannelOption.java

@@ -18,6 +18,7 @@
 import com.barchart.udt.OptionUDT;
 import io.netty.channel.ChannelOption;
 
+import static io.netty.channel.ChannelOption.valueOf;
 /**
  * Options for the UDT transport
  */

transport/src/main/java/io/netty/channel/DefaultChannelConfig.java

@@ -25,7 +25,6 @@
 import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
 
 import static io.netty.channel.ChannelOption.ALLOCATOR;
-import static io.netty.channel.ChannelOption.AUTO_CLOSE;
 import static io.netty.channel.ChannelOption.AUTO_READ;
 import static io.netty.channel.ChannelOption.CONNECT_TIMEOUT_MILLIS;
 import static io.netty.channel.ChannelOption.MAX_MESSAGES_PER_READ;