Change StateUnknown to StateInit

Signed-off-by: Lantao Liu <lantaol@google.com>

pkg/store/sandbox/sandbox.go

@@ -93,7 +93,7 @@ func (s *Store) Get(id string) (Sandbox, error) {
 	if err != nil {
 		return sb, err
 	}
-	if sb.Status.Get().State == StateUnknown {
+	if sb.Status.Get().State == StateInit {
 		return Sandbox{}, store.ErrNotExist
 	}
 	return sb, nil
@@ -123,7 +123,7 @@ func (s *Store) List() []Sandbox {
 	defer s.lock.RUnlock()
 	var sandboxes []Sandbox
 	for _, sb := range s.sandboxes {
-		if sb.Status.Get().State == StateUnknown {
+		if sb.Status.Get().State == StateInit {
 			continue
 		}
 		sandboxes = append(sandboxes, sb)

pkg/store/sandbox/sandbox_test.go

@@ -106,7 +106,7 @@ func TestSandboxStore(t *testing.T) {
 			},
 			NetNSPath: "TestNetNS-3defg",
 		},
-		Status{State: StateUnknown},
+		Status{State: StateInit},
 	)
 	assert := assertlib.New(t)
 	s := NewStore()

pkg/store/sandbox/status.go

@@ -22,15 +22,15 @@ import (
 )
 
 // State is the sandbox state we use in containerd/cri.
-// It has unknown state defined.
+// It has init state defined.
 type State uint32
 
 const (
-	// StateUnknown is unknown state of sandbox. Sandbox
-	// is in unknown state before its corresponding sandbox container
-	// is created. Sandbox in unknown state should be ignored by most
+	// StateInit is init state of sandbox. Sandbox
+	// is in init state before its corresponding sandbox container
+	// is created. Sandbox in init state should be ignored by most
 	// functions, unless the caller needs to update sandbox state.
-	StateUnknown State = iota
+	StateInit State = iota
 	// StateReady is ready state, it means sandbox container
 	// is running.
 	StateReady

pkg/store/sandbox/status_test.go

@@ -28,7 +28,7 @@ func TestStatus(t *testing.T) {
 	testStatus := Status{
 		Pid:       123,
 		CreatedAt: time.Now(),
-		State:     StateUnknown,
+		State:     StateInit,
 	}
 	updateStatus := Status{
 		Pid:       456,