MINOR: server: add a list of private idle connections

For now it's not populated but we have the list entry. It will carry
all idle connections that sessions don't want to share. They may be
used later to reclaim connections upon socket shortage for example.
diff --git a/include/types/server.h b/include/types/server.h
index 130c370..f72ca0c 100644
--- a/include/types/server.h
+++ b/include/types/server.h
@@ -166,6 +166,7 @@
 
 	struct list pendconns;			/* pending connections */
 	struct list actconns;			/* active connections */
+	struct list priv_conns;			/* private idle connections attached to stream interfaces */
 	struct task *warmup;                    /* the task dedicated to the warmup when slowstart is set */
 
 	struct conn_src conn_src;               /* connection source settings */
diff --git a/src/hlua.c b/src/hlua.c
index 1c2938b..08831ab 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -5060,6 +5060,7 @@
 	socket_tcp.obj_type = OBJ_TYPE_SERVER;
 	LIST_INIT(&socket_tcp.actconns);
 	LIST_INIT(&socket_tcp.pendconns);
+	LIST_INIT(&socket_tcp.priv_conns);
 	socket_tcp.state = SRV_ST_RUNNING; /* early server setup */
 	socket_tcp.last_change = 0;
 	socket_tcp.id = "LUA-TCP-CONN";
@@ -5103,6 +5104,7 @@
 	socket_ssl.obj_type = OBJ_TYPE_SERVER;
 	LIST_INIT(&socket_ssl.actconns);
 	LIST_INIT(&socket_ssl.pendconns);
+	LIST_INIT(&socket_ssl.priv_conns);
 	socket_ssl.state = SRV_ST_RUNNING; /* early server setup */
 	socket_ssl.last_change = 0;
 	socket_ssl.id = "LUA-SSL-CONN";
diff --git a/src/server.c b/src/server.c
index 503d53a..44f0dc3 100644
--- a/src/server.c
+++ b/src/server.c
@@ -886,6 +886,7 @@
 			newsrv->obj_type = OBJ_TYPE_SERVER;
 			LIST_INIT(&newsrv->actconns);
 			LIST_INIT(&newsrv->pendconns);
+			LIST_INIT(&newsrv->priv_conns);
 			do_check = 0;
 			do_agent = 0;
 			newsrv->flags = 0;