Make sure %<tt includes all [failed] connection attempts.

Make sure %<tt includes all [failed] connection attempts.

The old code was using zero n_tries to detect the first connection
attempt,
but n_tries is not incremented when we are opening a new connection
rather
than reusing an old one. Perhaps n_tries should be updated differently
as
well, but this change simply makes %<tt (hier.total_response_time)
management
independent from that [complex] counter.