Use a soft flush to reduce latency

[ColinSullivan1]

Use Connection.FlushBuffer() over Connection.Flush() to reduce overhead and latency.

Signed-off-by: Colin Sullivan colin@synadia.com

[ColinSullivan1]

I had only flushed in blocking calls (they have no handler), because the full flush (PING/PONG) was expensive, but with the soft flush I suppose it makes sense to always call it.

[ColinSullivan1]

On second thought, with async publishing users are more interested in performance rather than latency. Later, I'll do some benchmarks but for now want to the leave the async as is.