r14157: - pass a struct ntvfs_request to the ntvfs layer

r14157: - pass a struct ntvfs_request to the ntvfs layer
  (for now we just do #define ntvfs_request smbsrv_request,
   but it's the first step...)
- rename ntvfs_openfile() -> ntvfs_open()
- fix the talloc hierachie in some places in the ntvfs_map_*() code

metze
(This used to be commit ed9ed1f48f602354810937c0b0de850b44322191)