A process can have many vma-s and we can hit rlimit for files.

I suggest to dump vma files as soon as possible and close them.

v2: remove vm_file_fd from the vma_area structure

Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>