MINOR: server: export new_server() function

The new_server() function will be useful to create a proxy for the
master-worker.
diff --git a/include/proto/server.h b/include/proto/server.h
index 1c2d1fd..75cba47 100644
--- a/include/proto/server.h
+++ b/include/proto/server.h
@@ -50,6 +50,7 @@
 int srv_set_addr_via_libc(struct server *srv, int *err_code);
 int srv_init_addr(void);
 struct server *cli_find_server(struct appctx *appctx, char *arg);
+struct server *new_server(struct proxy *proxy);
 
 /* functions related to server name resolution */
 int snr_update_srv_status(struct server *s, int has_no_ip);
diff --git a/src/server.c b/src/server.c
index c0122b6..8d0ae74 100644
--- a/src/server.c
+++ b/src/server.c
@@ -1632,7 +1632,7 @@
 		srv->srvrq = src->srvrq;
 }
 
-static struct server *new_server(struct proxy *proxy)
+struct server *new_server(struct proxy *proxy)
 {
 	struct server *srv;
 	int i;