test: increase permissions for the "test" directory (v2)

Restoring mount namespaces requires to create temporary directories
in a test root.

When tests execute in a new userns, they have non-zero gid and uid,
so we need to grant permissions for them.

v2: add +rx as well

Reported-by: Mr Jenkins
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -471,6 +471,9 @@ start_test()
 	if [ -z "$USERNS" ]; then
 		unset ZDTM_USERNS
 	else
+		# we need to be able to create a temporary directory in a test
+		# root for restoring mount namespaces
+		chmod go+wxr .
 		export ZDTM_USERNS=1
 	fi