utimensat_tests: Make use of tst_kvcmp again

tst_kvercmp* binaries have been removed in:

commit 4847f1c13dabbfadd612aa812e2c99973f35f230
Author: Cyril Hrubis <chrubis@suse.cz>
Date:   Mon Nov 14 13:44:45 2016 +0100

apicmd: Get rid of tst_kvercmp* binaries.

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Acked-by: Jan Stancek <jstancek@redhat.com>
1 file changed