migrate to upstream libcompose in one and a half go

vendor/github.com/opencontainers/runc/libcontainer/cgroups/cgroups_test.go

@@ -3,27 +3,16 @@
 package cgroups
 
 import (
-	"bytes"
 	"testing"
 )
 
-const (
-	cgroupsContents = `11:hugetlb:/
-10:perf_event:/
-9:blkio:/
-8:net_cls:/
-7:freezer:/
-6:devices:/
-5:memory:/
-4:cpuacct,cpu:/
-3:cpuset:/
-2:name=systemd:/user.slice/user-1000.slice/session-16.scope`
-)
-
 func TestParseCgroups(t *testing.T) {
-	r := bytes.NewBuffer([]byte(cgroupsContents))
-	_, err := ParseCgroupFile("blkio", r)
+	cgroups, err := ParseCgroupFile("/proc/self/cgroup")
 	if err != nil {
 		t.Fatal(err)
 	}
+
+	if _, ok := cgroups["cpu"]; !ok {
+		t.Fail()
+	}
 }