hap-cfg: support new traces section

The global keyword trace is now unsupported. Replace it with the newly
introduced dedicated traces section.

Author: a-denoyelle

quic.cfg

@@ -4,22 +4,6 @@ global
     tune.ssl.keylog on
     lua-load sslkeylogger.lua
 
-    expose-experimental-directives
-    trace quic sink stderr
-    trace quic level developer
-    trace quic verbosity clean
-    trace quic start now
-
-    trace qmux sink stderr
-    trace qmux level developer
-    trace qmux verbosity minimal
-    trace qmux start now
-
-    trace h3 sink stderr
-    trace h3 level developer
-    trace h3 verbosity minimal
-    trace h3 start now
-
 defaults
 	mode http
 	timeout connect 5s
@@ -37,3 +21,19 @@ frontend fe
 
 backend be
 	server lighttpd 127.0.0.1:10080
+
+traces
+    trace quic sink stderr
+    trace quic level developer
+    trace quic verbosity clean
+    trace quic start now
+
+    trace qmux sink stderr
+    trace qmux level developer
+    trace qmux verbosity minimal
+    trace qmux start now
+
+    trace h3 sink stderr
+    trace h3 level developer
+    trace h3 verbosity minimal
+    trace h3 start now