samba-tool domain trust: fix trust compatibility to Windows Server 1709 and FreeIPA

Thu Apr 12 06:06:17 UTC 2018

New comment by abbra on Samba Github repository

https://github.com/samba-team/samba/pull/134#issuecomment-380689227
Comment:
The way we create trusts (in samba-tool and in FreeIPA), we depend on the session key which will not be there if SMB connection is not encrypted. So establishing trust will fail otherwise already.