test/pipes: execute two test cases

* reopen a pipe descriptor via /proc/self/fd/X
* give another end of a pipe to "criu restore"
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/pipes/Makefile

@@ -7,6 +7,8 @@ run: pipe
 	./pipe -c &&		\
 	./pipe -cl &&		\
 	./pipe -d &&		\
+	./pipe -o &&		\
+	./pipe -r &&		\
 	./pipe -dc &&		\
 	./pipe -dcl &&		\
 	true