tests/.gitignore: ignore test-throttle

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

tests/.gitignore

@@ -5,6 +5,7 @@ check-qjson
 check-qlist
 check-qstring
 test-aio
+test-throttle
 test-cutils
 test-hbitmap
 test-iov