Creates a new channel which is bound to the local address which was specified in the current {@code "localAddress"} option. This method issimilar to the following code:
{@link ServerBootstrap} b = ...;b.bind(b.getOption("localAddress"));
@return a new bound channel which accepts incoming connections
@throws IllegalStateException if {@code "localAddress"} option was not set
@throws ClassCastException if {@code "localAddress"} option's value isneither a {@link SocketAddress} nor {@code null}
@throws ChannelException if failed to create a new channel and bind it to the local address