Revert "s3:winbindd_user: create domain connection in winbindd_fill_pwent if necessary."

Revert "s3:winbindd_user: create domain connection in winbindd_fill_pwent if necessary."

This reverts commit 3981603761a1cc6fb74ff135fadf4ab3340be1c5.

I was confused about the real meaning of find_domain_from_name_noinit()
vs. find_domain_from_name(). We don't need the connection established
here, just the domain struct which gets initialized by rescan_trusted_domains().

Sorry for the noise.

Michael
(cherry picked from commit c8e295a1b5216c1190ec5d555606b3eadabab82a)