[PATCH] %>la for intercepted connections

%>la for intercepted connections

This patch adjusts the %>la logformat code handling for intercepted
connections
based on the following rules:
  - If the corresponding http_port or https_port option has an explicit
    listening host name or IP address, then log the IP address.
  - Otherwise, log a dash character.

Also adjusts %>lp logformat code handling for intercepted connections to
always
log the port number from the corresponding http_port or https_port option.