test/rpc: unlink pidfile at the end

It's required to execute the test a few times
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/rpc/run.sh

@@ -23,6 +23,7 @@ function start_server {
 function stop_server {
 	title_print "Shutdown service server"
 	kill -SIGTERM $(cat build/pidfile)
+	unlink build/pidfile
 }
 
 function test_c {