test: Fix 898 and 928

1. Catch up with the interface change in
   ihk_os_destroy_pseudofs() and ihk_os_create_pseudofs()
2. Expect ihk_os_shutdown() to return zero when the OS had been shut
   down

Refs: #898
Refs: #928
Change-Id: Ic430550ebfd5cd21164eefaed155fe769adf8395

test/mng_mod/issues/898_928/util.h

@@ -0,0 +1,7 @@
+#ifndef __UTIL_H_INCLUDED__
+#define __UTIL_H_INCLUDED__
+
+#define Q(x) #x
+#define QUOTE(x) Q(x)
+
+#endif