zdtm/cgroup01: create more than one empty cgroups

We found a bug, when a second cgroup is restored incorrectly,
so let's create one more empty cgroup.
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/cgroup.hook

@@ -9,7 +9,8 @@ echo "Cleaning $tname"
 
 set +e
 rmdir "$tname/subcg/subsubcg/"
-rmdir "$tname/subcg/empty/"
+rmdir "$tname/subcg/empty.0/"
+rmdir "$tname/subcg/empty.1/"
 rmdir "$tname/subcg/"
 set -e
 

test/zdtm/live/static/cgroup01.c

@@ -17,7 +17,7 @@ static const char *empty = "empty";
 
 int main(int argc, char **argv)
 {
-	int cgfd, l, ret = 1;
+	int cgfd, l, ret = 1, i;
 	char aux[1024], paux[1024];
 	FILE *cgf;
 	struct stat st;
@@ -55,8 +55,13 @@ int main(int argc, char **argv)
 		goto out_rs;
 	}
 
-	sprintf(paux, "%s/%s/%s", dirname, subname, empty);
-	mkdir(paux, 0600);
+	for (i = 0; i < 2; i++) {
+		sprintf(paux, "%s/%s/%s.%d", dirname, subname, empty, i);
+		if (mkdir(paux, 0600)) {
+			err("mkdir %s", paux);
+			return 1;
+		}
+	}
 
 	test_daemon();
 	test_waitsig();
@@ -71,10 +76,14 @@ int main(int argc, char **argv)
 		char *s;
 
 		s = strstr(paux, cgname);
-		if (s) {
+		if (!s)
+			continue;
+
 		sscanf(paux, "%*d %*d %*d:%*d %*s %s", aux);
 		test_msg("found cgroup at %s\n", aux);
-			sprintf(paux, "%s/%s/%s", aux, subname, empty);
+
+		for (i = 0; i < 2; i++) {
+			sprintf(paux, "%s/%s/%s.%d", aux, subname, empty, i);
 			if (stat(paux, &st)) {
 				fail("couldn't stat %s\n", paux);
 				ret = -1;
@@ -86,12 +95,12 @@ int main(int argc, char **argv)
 				ret = -1;
 				goto out_close;
 			}
+		}
 
 		pass();
 		ret = 0;
 		goto out_close;
 	}
-	}
 
 	fail("empty cgroup not found!\n");