ipatests: make sure ipa-client-automount reverts sssd.conf
    
    Due to https://pagure.io/SSSD/sssd/issue/4149 ipa-client-automount
    fails to remove the ipa_automount_location entry from sssd.conf.
    Test that autofs_provider and ipa_automount_location are removed.
    
    Fixes: https://pagure.io/freeipa/issue/8190
    Signed-off-by: François Cami <fcami@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>