[PATCH 0/3] Introduce the cloning with pids functionality

[Pavel Emelyanov]

When restoring a task (or a set of tasks) we need to recreate them 
with exactly the same pid(s) as they had before. Thus we need the 
ability to create a task with specified pid. The proposal is to reuse 
the already free CLONE_STOPPED clone flag, introduce the new one
called CLONE_CHILD_USEPIDS and point to the desired pids with the
child_tidptr.

There are two cnages from the previous set doing the same.

1. The child_tidptr points to an array of pids for current namespace 
   and its ancestors. When 0 is met in this array the pid number for
   the corresponding namespace is generated, rather than set.

2. For security reasons after a regular clone/fork is done in a namespace
   further cloning with predefined pid is not allowed.

Signed-off-by: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
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