IFP: Add domain and domainname attributes to the user
org.freedekstop.sssd.infopipe.Users.User gets two new attributes:
- domain: object path of user's domain
- domainname: user's domain name
org.freedekstop.sssd.infopipe.GetUserAttr can now request new attribute:
- domainname: user's domain name
Resolves:
https://pagure.io/SSSD/sssd/issue/2714
Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com>