'Rescue the specified instance.
:param nova.context.RequestContext context:
The context for the rescue.
:param nova.objects.instance.Instance instance:
The instance being rescued.
:param nova.network.model.NetworkInfo network_info:
Necessary network information for the resume.
:param nova.objects.ImageMeta image_meta:
The metadata of the image of the instance.
:param rescue_password: new root password to set for rescue.'

def rescue(self, context, instance, network_info, image_meta, rescue_password):

    raise NotImplementedError()
