test/ext-links: fix path to the ip tool

run.sh: line 17: xip: command not found
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/ext-links/run.sh

 #!/bin/bash
 
-ip=${CR_IP_TOOL:-xip}
+ip=${CR_IP_TOOL:-ip}
 mvln="mv0"
 finf="finish"
 outf="ns_output"