Returns a list of tags for every guest server that is detected by the OpenStack
        integration.
        List of pairs (hostname, list_of_tags)

def get_external_host_tags(self):
        """ Returns a list of tags for every guest server that is detected by the OpenStack
        integration.
        List of pairs (hostname, list_of_tags)
        """
        self.log.debug("Collecting external_host_tags now")
        external_host_tags = []
        for k, v in iteritems(self.external_host_tags):
            external_host_tags.append((k, {SOURCE_TYPE: v}))

        self.log.debug("Sending external_host_tags: %s", external_host_tags)
        return external_host_tags