virtcontainers: reimplement sandbox cgroup

All containers run in different cgroups even the sandbox, with this new
implementation the sandbox cpu cgroup wil be equal to the sum of all its
containers and the hypervisor process will be placed there impacting to the
containers running in the sandbox (VM). The default number of vcpus is
used when the sandbox has no constraints. For example, if default_vcpus
is 2, then quota will be 200000 and period 100000.

**c-ray test**
http://www.futuretech.blinkenlights.nl/c-ray.html

```
+=============================================+
|         | 6 threads 6cpus | 1 thread 1 cpu  |
+=============================================+
| current |   40 seconds    |   122 seconds   |
+==============================================
|   new   |   37 seconds    |   124 seconds   |
+==============================================
```

current = current cgroups implementation
new = new cgroups implementation

**workload**

```yaml
apiVersion: v1
kind: Pod
metadata:
  name: c-ray
  annotations:
    io.kubernetes.cri.untrusted-workload: "true"
spec:
  restartPolicy: Never
  containers:
  - name: c-ray-1
    image: docker.io/devimc/c-ray:latest
    imagePullPolicy: IfNotPresent
    args: ["-t", "6", "-s", "1600x1200", "-r", "8", "-i",
          "/c-ray-1.1/sphfract", "-o", "/tmp/output.ppm"]
    resources:
      limits:
        cpu: 6
  - name: c-ray-2
    image: docker.io/devimc/c-ray:latest
    imagePullPolicy: IfNotPresent
    args: ["-t", "1", "-s", "1600x1200", "-r", "8", "-i",
          "/c-ray-1.1/sphfract", "-o", "/tmp/output.ppm"]
    resources:
      limits:
        cpu: 1
```

fixes kata-containers#1153

Signed-off-by: Julio Montes <julio.montes@intel.com>

virtcontainers/api.go

@@ -120,11 +120,6 @@ func createSandboxFromConfig(ctx context.Context, sandboxConfig SandboxConfig, f
 		return nil, err
 	}
 
-	// Setup host cgroups
-	if err = s.setupCgroups(); err != nil {
-		return nil, err
-	}
-
 	return s, nil
 }
 

virtcontainers/api_test.go

@@ -18,6 +18,7 @@ import (
 	"testing"
 
 	"github.com/containernetworking/plugins/pkg/ns"
+	"github.com/kata-containers/runtime/virtcontainers/pkg/annotations"
 	"github.com/kata-containers/runtime/virtcontainers/pkg/mock"
 	vcTypes "github.com/kata-containers/runtime/virtcontainers/pkg/types"
 	"github.com/kata-containers/runtime/virtcontainers/types"
@@ -30,13 +31,15 @@ const (
 )
 
 var sandboxAnnotations = map[string]string{
-	"sandbox.foo":   "sandbox.bar",
-	"sandbox.hello": "sandbox.world",
+	"sandbox.foo":             "sandbox.bar",
+	"sandbox.hello":           "sandbox.world",
+	annotations.ConfigJSONKey: `{"linux":{"resources":{}}}`,
 }
 
 var containerAnnotations = map[string]string{
-	"container.foo":   "container.bar",
-	"container.hello": "container.world",
+	"container.foo":           "container.bar",
+	"container.hello":         "container.world",
+	annotations.ConfigJSONKey: `{"linux":{"resources":{}}}`,
 }
 
 func newBasicTestCmd() types.Cmd {