Fix port clash in socket tests

Use ephemeral port instead.

Author: nikic

ext/sockets/tests/socket_set_block-retval.phpt

@@ -9,11 +9,11 @@ if (!extension_loaded('sockets')) {
 --FILE--
 <?php
 
-$socket = socket_create_listen(31339);
+$socket = socket_create_listen(0);
 var_dump(socket_set_block($socket));
 socket_close($socket);
 
-$socket2 = socket_create_listen(31340);
+$socket2 = socket_create_listen(0);
 socket_close($socket2);
 var_dump(socket_set_block($socket2));
 

ext/sockets/tests/socket_set_nonblock-retval.phpt

@@ -9,11 +9,11 @@ if (!extension_loaded('sockets')) {
 --FILE--
 <?php
 
-$socket = socket_create_listen(31339);
+$socket = socket_create_listen(0);
 var_dump(socket_set_nonblock($socket));
 socket_close($socket);
 
-$socket2 = socket_create_listen(31340);
+$socket2 = socket_create_listen(0);
 socket_close($socket2);
 var_dump(socket_set_nonblock($socket2));