ipatests: Fix TestAJPSecretUpgrade tests on systems without pkiuser
Tests in `test_ipaserver.test_secure_ajp_connector' assume that there
is pkiuser in OS, but this is not always true (for example, in systems
having minimum installed dependencies, in particular, without pki-server
RPM package). Since the tests already use the mock and pkiuser entity is
not the subject of testing the pwd.getpwnam has been mocked.
Fixes: https://pagure.io/freeipa/issue/8942
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>