Revert "restore: pipes -- Allow to reuse descriptors"
Revert "restore: pipes -- Allow to reuse descriptors"

This reverts commit 46c613cc7d869ebf39532a1def054de7678e441f.

Andrey posted a proper fix for it. Moreover, the problem in first
place was initiated by a parasite application running during test
case, crtools knows nothing about.

Signed-off-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>

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