pkg/annotations: Export CRI-O annotations namespace

Some runtimes like Clear Containers need to interpret the CRI-O
annotations, to distinguish the infra container from the regular one.
Here we export those annotations and use a more standard dotted
namespace for them.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

server/container.go

@@ -6,13 +6,6 @@ import (
 	"github.com/kubernetes-incubator/cri-o/oci"
 )
 
-const (
-	// containerTypeSandbox represents a pod sandbox container
-	containerTypeSandbox = "sandbox"
-	// containerTypeContainer represents a container running within a pod
-	containerTypeContainer = "container"
-)
-
 func (s *Server) getContainerFromRequest(cid string) (*oci.Container, error) {
 	if cid == "" {
 		return nil, fmt.Errorf("container ID should not be empty")