rusage and ihklib: Fix out-of-memory reporting and cleanup

1. Fix OOM: Count memory usage only when allocation succeeded
2. Fix OOM: Make user allocation fail when memory is running out
3. Fix OOM: Move rusage_init() before numa_init()
4. Cleanup: Rename ihkconfig/ihkosctl functions
5. Cleanup: Pass event type to eventfd()
6. Cleanup: arch/.../rusage.h --> arch/.../arch_rusage.h

arch/x86/tools/mcreboot-smp-x86.sh.in

@@ -372,7 +372,7 @@ fi
 
 if [ "$ikc_map" != "" ]; then
 	# Specify IKC map
-	if ! ${SBINDIR}/ihkosctl 0 ikc_map ${ikc_map}; then
+	if ! ${SBINDIR}/ihkosctl 0 set ikc_map ${ikc_map}; then
 		echo "error: assign CPUs" >&2
 		error_exit "os_created"
 	fi