wbclient: fix wbcLookupName with UPN

[Isaac Boukris]

Hi,

The attached patch fixes the case where the UPN differs from
user at domain (both components can be different).
It works fine even when empty domain is specified.

Review appreciated.

btw, any thoughts on this pull request?
https://github.com/samba-team/samba/pull/102

Thanks!
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