UpdateIdentity.
        :param :class:`<Identity> <azure.devops.v5_0.identity.models.Identity>` identity:
        :param str identity_id:

def update_identity(self, identity, identity_id):
        """UpdateIdentity.
        :param :class:`<Identity> <azure.devops.v5_0.identity.models.Identity>` identity:
        :param str identity_id:
        """
        route_values = {}
        if identity_id is not None:
            route_values['identityId'] = self._serialize.url('identity_id', identity_id, 'str')
        content = self._serialize.body(identity, 'Identity')
        self._send(http_method='PUT',
                   location_id='28010c54-d0c0-4c89-a5b0-1c9e188b9fb7',
                   version='5.0',
                   route_values=route_values,
                   content=content)