s3:utils: Handle the domain before username and password

s3:utils: Handle the domain before username and password

The cli_credentials_get_password*() function will interactively ask the
user for a password if none has been supplied via another ways. To show
the correct domain and username in the prompt, we need handle domain
and user first.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15538

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
(cherry picked from commit 25021b836f74d3d247bce44c6c02a2d8b2cc39ea)