func RegisterContainerPlugin(cp ContainerPlugin) {
	containerPlugin = cp
}
RegisterContainerPlugin is used to register container plugin.
package hookplugins
import (
	localtypes "github.com/pouchcontainer/d2p-migrator/pouch/types"
)
type ContainerPlugin interface {
	PostConvert(dockerHomeDir string, cont *localtypes.Container) error
}
var containerPlugin ContainerPlugin