smbd: add smbXsrv_session to smbXsrv_open

smbd: add smbXsrv_session to smbXsrv_open

From "MS-SMB2 3.3.1.10 Per Open":

  Open.Session: A reference to the authenticated session, as specified in section
  3.3.1.8, over which this open was performed. If the open is not attached to a
  session at this time, this value MUST be NULL.

Needed to implement:

  3.3.5.9 Receiving an SMB2 CREATE Request

  If the server implements the SMB 3.x dialect family and all of the following
  conditions are TRUE, the server MUST look up an Open in GlobalOpenTable where
  Open.IsReplayEligible is TRUE and Open.CreateGuid matches the CreateGuid in
  the SMB2_CREATE_DURABLE_HANDLE_REQUEST_V2 create context and Open.ClientGuid
  matches the ClientGuid of the connection that received this request:

  ...

  If an Open is found, the server MUST perform the following:

  ..

  If Open.Session.SessionId is not equal to the current Session.SessionId, the
  server MUST fail the request with STATUS_DUPLICATE_OBJECTID.

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>