Add a new upgrade test. Scenario:
- create an empty /var/lib/pki/pki-tomcat/kra directory
- call ipa-server-upgrade
With issue 8596, the upgrade fails because it assumes KRA is
installed. With the fix, ipa-server-upgrade completes successfully.
Related: https://pagure.io/freeipa/issue/8596
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>