s3:smbd: use fsp_persistent_id() as persistent_file_id part for SMB2 (bug #8995)

s3:smbd: use fsp_persistent_id() as persistent_file_id part for SMB2 (bug #8995)

It seems to be important to have unique persistent file ids,
because windows clients seem to index files by server_guid + persistent_file_id.
Which may break, if we just have a 16-bit range per connection
and the client connects multiple times.

Based on code from Ira Cooper. Use fsp->fh->gen_id as the persistent
fileid in SMB2.

metze

Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Thu Jun 14 22:04:13 CEST 2012 on sn-devel-104

Signed-off-by: Jeremy Allison <jra@samba.org>