CVE: Add some existing tests to runtest/cve

Add syscalls/keyctl02 and commands/keyctl01 to the CVE runtest file as
cve-2015-7550 and cve-2016-4470 respectively.

Signed-off-by: Guangwen Feng <fenggw-fnst@cn.fujitsu.com>
diff --git a/runtest/cve b/runtest/cve
index 468f0b2..5b16e9e 100644
--- a/runtest/cve
+++ b/runtest/cve
@@ -5,6 +5,8 @@
 cve-2012-0957 cve-2012-0957
 cve-2014-0196 cve-2014-0196
 cve-2015-0235 gethostbyname_r01
+cve-2015-7550 keyctl02
+cve-2016-4470 keyctl01.sh
 cve-2016-4997 cve-2016-4997
 cve-2016-5195 dirtyc0w
 cve-2016-7042 cve-2016-7042