MINOR: http-ana: Rely on addresses at stream level to set xff and xot headers

MINOR: http-ana: Rely on addresses at stream level to set xff and xot headers

Client source and destination addresses at stream level are now used to emit
X-Forwarded-For and X-Original-To headers. For now, stream-interface addresses
are never set. So, thanks to the fallback mechanism, no changes are expected
with this patch. But its purpose is to rely on addresses at the stream level,
when set, instead of those at the connection level.