ct: open namespace proc files for read-only
ct: open namespace proc files for read-only

Signed-off-by: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@openvz.org>

avagin/libct,xemul/libct,hallyn/libct,avagin/libct,xemul/libct,avagin/libct,xemul/libct,hallyn/libct,hallyn/libct,xemul/libct