s4-s3upgrade: Force ldapsam:trusted = yes

s4-s3upgrade: Force ldapsam:trusted = yes

While this setting is not the default in Samba3, any domain that is
in a suitable condition to upgrade to Samba4 should already be in the
layout that ldapsam:trusted uses.  It can be turned off by setting
ldapsam:trusted=false in the smb.conf.

Many upgrades to Samba4 happen on a different host to the old Samba3 domain
and this avoids the need to configure nss_ldap only for the duration of
the upgrade.

Andrew Bartlett