syscalls/keyctl02: Add new regression test

Fixed by:
commit b4a1b4f5047e4f54e194681125c74c0aa64d637d
Author: David Howells <dhowells@redhat.com>
Date:   Fri Dec 18 01:34:26 2015 +0000

    KEYS: Fix race between read and revoke

Signed-off-by: Guangwen Feng <fenggw-fnst@cn.fujitsu.com>
4 files changed