group-add-member fails with an external member
    
    The command ipa group-add-member --external aduser@addomain.test
    fails with an internal error when used with samba 4.19.
    
    The command internally calls samba.security.dom_sid(sid) which
    used to raise a TypeError but now raises a ValueError
    (commit 9abdd67 on https://github.com/samba-team/samba).
    
    IPA source code needs to handle properly both exception types.
    
    Fixes: https://pagure.io/freeipa/issue/9466
    
    Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>