Make fasttest pass without ~/.ipa/default.conf
    
    Some fast tests depend on an api.env with realm, domain, and host. On
    machines without ~/.ipa/default.conf, the settings are not available.
    Provide dummy values to make tests pass.
    
    Closes: https://pagure.io/freeipa/issue/7432
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Aleksei Slaikovskii <aslaikov@redhat.com>