Add example apache metrics-friendly config
Add example apache metrics-friendly config

Add a new custom apache LogFormat for getting the most out of apache
request logging.

`LogFormat "%v:%p %R %m %>s %H conn=%X %D %O %I %k" metrics`

New metrics are now possible:
* apache_http_requests_total
* apache_http_connections_total (only partly useful)
* apache_http_requests_time_microseconds_total
* apache_http_sent_bytes_total
* apache_http_recieved_bytes_total

All of these metrics are by server_port, handler, request_method,
request_status, request_protocol.

google/mtail,google/mtail,SuperQ/mtail,SuperQ/mtail