add_key01 from ubuntu_ltp_syscalls failed on Trusty

Issue found on Trusty 3.13.0-177-generic

<<<test_start>>>
tag=add_key01 stime=1590050664
cmdline="add_key01"
contacts=""
analysis=exit
<<<test_output>>>
tst_buffers.c:55: INFO: Test is using guarded buffers
incrementing stop
tst_test.c:1246: INFO: Timeout per run is 0h 05m 00s
add_key01.c:63: INFO: The key type is keyrings and plen is 0
add_key01.c:79: PASS: add_key call succeeded as expected
add_key01.c:63: INFO: the key type is keyrings and plen is 1
add_key01.c:83: PASS: add_key call failed as expected: EINVAL (22)
add_key01.c:63: INFO: The key type is user and plen is 32767
add_key01.c:77: FAIL: add_key call failed unexpectedly: EDQUOT (122)
add_key01.c:63: INFO: The key type is user and plen is 32768
add_key01.c:83: PASS: add_key call failed as expected: EINVAL (22)
add_key01.c:63: INFO: The key type is logon and plen is 32767
add_key01.c:77: FAIL: add_key call failed unexpectedly: EDQUOT (122)
add_key01.c:63: INFO: The key type is logon and plen is 32768
add_key01.c:83: PASS: add_key call failed as expected: EINVAL (22)
add_key01.c:63: INFO: The key type is big_key and plen is 1048575
add_key01.c:79: PASS: add_key call succeeded as expected
add_key01.c:63: INFO: The key type is big_key and plen is 1048576
add_key01.c:83: PASS: add_key call failed as expected: EINVAL (22)

Summary:
passed 6
failed 2
skipped 0
warnings 0