This exhibit a deadlock we see sometimes when using docker cli connected
to a daemon through a named pipe with some data in the input stream (ie:
`echo "hello" | docker run ... `)
The problem seems to be that the EOF 0-length message is collapsed with
the previous message, if the buffer associated with the named pipe is
not previously flushed
Signed-off-by: Simon Ferquel <simon.ferquel@docker.com>
