Should we set tcp_nodelay true for Pipe.SinkChannel

[Regis]

Hi,

As we known, Harmony used loop socket to implement j.n.c.Pipe. On some 
platforms, data written from one socket side would not send to other side 
immediately, that cause data delay in our Pipe.

It's a problem in o.a.h.nio.internal.SelectorImpl, which used Pipe to wake up 
blocked select, so if the delay happened, select would not be interrupted, even 
Selector.wakeup() has finished. So I propose that setting tcp_nodelay to true 
for Pipe.SinkChannel to help this. I'm not sure whether this change may affect 
Pipe performance because of not using socket buffer. What do you think?

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Best Regards,
Regis.