sendFd shouldn't close the fd argument

[JohnLato]

I think most of the time you don't want it closed, and currently there's no way to avoid it.

[kazu-yamamoto]

@eborden It is easy to implement this by removing closeFd from sendFd. What do you think?

[eborden]

@kazu-yamamoto It is pretty typical to close the fd after sending. It isn't required or always what you want so it is probably correct to remove closeFd from sendFd. Its inclusion is more of a high level approach, which isn't really the intent in network any more.