Now timing information (completion, request, processing), status code
and request path are listed in the order by completion time.  This
ordering is very convenient to check resource prioritization
validation.

It turns out that we don't need circular buffer functionality.  We
replaced RingBuf with simple sequential Buffer.

It requires more careful optimization.  Remove it for now.

Make num_accept unlimited so that we can accept all pending
connections waiting in listen queue.

This test reveals bug in SPDY upstream code, and contains its fix.