Add tests for ipa-cacert-manage install
Some basic tests like re-loading a certificate, loading a
PKCS#7 cert and bad cert handling.
Signed-off-by: Rob Crittenden <rcritten@redhat.com>
https://pagure.io/freeipa/issue/7579
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>