MINOR: h1-htx/http-ana: Set BODYLESS flag on message in TUNNEL state

When a H1 message is parsed, if the parser state is switched to TUNNEL mode
just after the header parsing, the BODYLESS flag is set on the HTX
start-line. By transitivity, the corresponding flag is set on the message in
HTTP analysers.  Thus it is possible to rely on it to not wait for the
request body.
diff --git a/src/h1_htx.c b/src/h1_htx.c
index a2ee510..734f9cb 100644
--- a/src/h1_htx.c
+++ b/src/h1_htx.c
@@ -146,6 +146,8 @@
 		else
 			flags |= HTX_SL_F_BODYLESS;
 	}
+	if (h1m->state == H1_MSG_TUNNEL)
+		flags |= HTX_SL_F_BODYLESS;
 	return flags;
 }