test: use sleep() for mtime delay

For filesystems without high-resolution time support, an usleep() is too short
to alter mtime. Though 1s is quite safe, sleep for 2s in case it gets awaken
right within that second.

test/pidfile.c

@@ -41,7 +41,7 @@ static int mtime()
 	char buf[80];
 
 	/* Must sleep a while here otherwise we execute too fast => no mtime change :-( */
-	usleep(10000);
+	sleep(2);
 
 	PRINT("Calling pidfile() again to update mtime ...\n");
 	if (pidfile(pidfile_arg))

test/touch.c

@@ -23,7 +23,7 @@ static int mtime(char *file)
 	stat(file, &before);
 
 	/* Must sleep a while here otherwise we execute too fast => no mtime change :-( */
-	usleep(10000);
+	sleep(2);
 
 	PRINT("Calling touch() again to update mtime ...\n");
 	if (touch(file)) {