Kill child threads when receiving terminating signals(redmine#63)

Create process table (child is missing when sending a signal to a child process just after forking it)(redmine#61)

kernel/init.c

@@ -211,8 +211,11 @@ static void post_init(void)
 	}
 
 	if (find_command_line("hidos")) {
+		extern ihk_spinlock_t syscall_lock;
+
 		init_host_syscall_channel();
 		init_host_syscall_channel2();
+		ihk_mc_spinlock_init(&syscall_lock);
 	}
 	ap_start();
 }