Enable ephemeral KRA requests
    
    Enabling ephemeral KRA requests will reduce the amount of LDAP
    write operations and improve overall performance.
    
    Re-order some imports and shorten some lines to make pep8 happy.
    
    Fixes: https://pagure.io/freeipa/issue/6703
    
    Signed-off-by: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>