ubuntu_qrt_kernel_panic test failed with keyctl not found

This is a new test added on Mon Oct 22

 FAIL: test_cve_2015_8539 (__main__.KernelPanicTest)
 Verify CVE-2015-8539 is fixed
 ----------------------------------------------------------------------
 Traceback (most recent call last):
   File "./test-kernel-panic.py", line 114, in test_cve_2015_8539
     self.assertShellExitEquals(1, ['keyctl', 'request2', 'user', 'user', '', '@u'])
   File "/home/ubuntu/autotest/client/tmp/ubuntu_qrt_kernel_panic/src/qa-regression-testing/scripts/testlib.py", line 1140, in assertShellExitEquals
     self.assertEqual(expected, rc, msg + result + report)
 AssertionError: Got exit code 127, expected 1
 Command: 'keyctl', 'request2', 'user', 'user', '', '@u'
 Output:
 [Errno 2] No such file or directory

The keyutils package become a must.