BUG/MINOR: lua: Fix Server.get_addr() port values

The get_addr() method of the Lua Server class was using the
'sockaddr_storage addr' member to get the port value. HAProxy does not
store ports in this member as it uses a separate member, called
'svc_port'.

This fix should be backported to 1.7.
diff --git a/src/hlua_fcn.c b/src/hlua_fcn.c
index db46279..008b60d 100644
--- a/src/hlua_fcn.c
+++ b/src/hlua_fcn.c
@@ -545,8 +545,7 @@
 		          addr, INET_ADDRSTRLEN);
 		luaL_addstring(&b, addr);
 		luaL_addstring(&b, ":");
-		snprintf(addr, INET_ADDRSTRLEN, "%d",
-		         ntohs(((struct sockaddr_in *)&srv->addr)->sin_port));
+		snprintf(addr, INET_ADDRSTRLEN, "%d", srv->svc_port);
 		luaL_addstring(&b, addr);
 		break;
 	case AF_INET6:
@@ -554,8 +553,7 @@
 		          addr, INET_ADDRSTRLEN);
 		luaL_addstring(&b, addr);
 		luaL_addstring(&b, ":");
-		snprintf(addr, INET_ADDRSTRLEN, "%d",
-		         ntohs(((struct sockaddr_in6 *)&srv->addr)->sin6_port));
+		snprintf(addr, INET_ADDRSTRLEN, "%d", srv->svc_port);
 		luaL_addstring(&b, addr);
 		break;
 	case AF_UNIX: