The absent image file on shared resources preparation now means -- no resources
for this pid (zombies will not have these files).

This is not the most elegant solution, but I don't have anything better in mind.
Need to think over, all the more so we're most likely about to reimplement the
way image is stored some day in the future.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>