lib:util: Log mkdir error on correct debug levels

lib:util: Log mkdir error on correct debug levels

For smbd we want an error and for smbclient we only want it in NOTICE
debug level.
The default log level of smbclient is log level 1 so we need notice to
not spam the user.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14253

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Guenther Deschner <gd@samba.org>
Autobuild-User(master): Günther Deschner <gd@samba.org>
Autobuild-Date(master): Mon Jan 27 15:55:24 UTC 2020 on sn-devel-184

(cherry picked from commit 0ad6a243b259d284064c0c5abcc7d430d55be7e1)

Autobuild-User(v4-10-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-10-test): Mon Feb  3 14:10:49 UTC 2020 on sn-devel-144