MINOR: quic: Redefine control layer callbacks which are QUIC specific.

We add src/quic_sock.c QUIC specific socket management functions as callbacks
for the control layer: ->accept_conn, ->default_iocb and ->rx_listening.
accept_conn() will have to be defined. The default I/O handler only recvfrom()
the datagrams received. Furthermore, ->rx_listening callback always returns 1 at
this time but should returns 0 when reloading the processus.
diff --git a/src/proto_quic.c b/src/proto_quic.c
index bde3e48..751fc49 100644
--- a/src/proto_quic.c
+++ b/src/proto_quic.c
@@ -41,6 +41,7 @@
 #include <haproxy/proto_udp.h>
 #include <haproxy/proxy-t.h>
 #include <haproxy/sock.h>
+#include <haproxy/quic_sock.h>
 #include <haproxy/sock_inet.h>
 #include <haproxy/tools.h>
 
@@ -63,7 +64,7 @@
 	.unbind         = default_unbind_listener,
 	.suspend        = default_suspend_listener,
 	.resume         = default_resume_listener,
-	.accept_conn    = sock_accept_conn,
+	.accept_conn    = quic_sock_accept_conn,
 	.connect        = quic_connect_server,
 
 	/* binding layer */
@@ -79,8 +80,8 @@
 	.rx_enable      = sock_enable,
 	.rx_disable     = sock_disable,
 	.rx_unbind      = sock_unbind,
-	.rx_listening   = sock_accepting_conn,
-	.default_iocb   = sock_accept_iocb,
+	.rx_listening   = quic_sock_accepting_conn,
+	.default_iocb   = quic_sock_fd_iocb,
 	.receivers      = LIST_HEAD_INIT(proto_quic4.receivers),
 	.nb_receivers   = 0,
 };
@@ -100,7 +101,7 @@
 	.unbind         = default_unbind_listener,
 	.suspend        = default_suspend_listener,
 	.resume         = default_resume_listener,
-	.accept_conn    = sock_accept_conn,
+	.accept_conn    = quic_sock_accept_conn,
 	.connect        = quic_connect_server,
 
 	/* binding layer */
@@ -116,8 +117,8 @@
 	.rx_enable      = sock_enable,
 	.rx_disable     = sock_disable,
 	.rx_unbind      = sock_unbind,
-	.rx_listening   = sock_accepting_conn,
-	.default_iocb   = sock_accept_iocb,
+	.rx_listening   = quic_sock_accepting_conn,
+	.default_iocb   = quic_sock_fd_iocb,
 	.receivers      = LIST_HEAD_INIT(proto_quic6.receivers),
 	.nb_receivers   = 0,
 };