Rm useless init.sh, init_hello and poweroff are not init specific, so rename them more generically

kernel_module/user/sleep_forever.c

@@ -0,0 +1,10 @@
+/* Sleeping beauty, your prince is called Ctrl + C. */
+
+#include <stdio.h>
+#include <unistd.h>
+
+int main(void) {
+	puts(__FILE__);
+	while (1)
+		sleep(0xFFFFFFFF);
+}