MEDIUM: logs: Add HTTP request-line log format directives

This commit adds 4 new log format variables that parse the
HTTP Request-Line for more specific logging than "%r" provides.

For example, we can parse the following HTTP Request-Line with
these new variables:

  "GET /foo?bar=baz HTTP/1.1"

- %HM: HTTP Method ("GET")
- %HV: HTTP Version ("HTTP/1.1")
- %HU: HTTP Request-URI ("/foo?bar=baz")
- %HP: HTTP Request-URI without query string ("/foo")
diff --git a/include/types/log.h b/include/types/log.h
index 345a09f..bbfe020 100644
--- a/include/types/log.h
+++ b/include/types/log.h
@@ -93,6 +93,10 @@
 	LOG_FMT_HDRREQUESTLIST,
 	LOG_FMT_HDRRESPONSLIST,
 	LOG_FMT_REQ,
+	LOG_FMT_HTTP_METHOD,
+	LOG_FMT_HTTP_URI,
+	LOG_FMT_HTTP_PATH,
+	LOG_FMT_HTTP_VERSION,
 	LOG_FMT_HOSTNAME,
 	LOG_FMT_UNIQUEID,
 	LOG_FMT_SSL_CIPHER,