Integration test: add a test for upgrade and PKI drop-in file
    
    Add an upgrade test with the following scenario:
    - remove PKI drop-in file (to simulate an upgrade from an old
    version)
    - remove caECServerCertWithSCT profile from LDAP
    - launch the ipa-server-upgrade command
    - check that the upgrade added the file
    
    Related: https://pagure.io/freeipa/issue/9381
    
    Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>