s3-winbindd: use wcache_query_user_fullname after inspecting samlogon cache.

s3-winbindd: use wcache_query_user_fullname after inspecting samlogon cache.

The reason for this followup query is that very often the samlogon cache only
contains a info3 netlogon user structure that has been retrieved during a
netlogon samlogon authentication using "network" logon level. With that logon
level only a few info3 fields are filled in; the user's fullname is never filled
in that case. This is problematic when the cache is used to fill in the user's
gecos field (for NSS queries). When we have retrieved the user's fullname during
other queries, reuse it from the other caches.

Thanks to Matt Rogers <mrogers@redhat.com>.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=10440

Guenther

Pair-Programmed-With: Andreas Schneider <asn@samba.org>
Signed-off-by: Guenther Deschner <gd@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>