UnPause a vm

    .. code-block:: bash

        salt-cloud -a unpause xenvm01

def unpause(name, call=None, session=None):
    '''
    UnPause a vm

    .. code-block:: bash

        salt-cloud -a unpause xenvm01

    '''
    if call == 'function':
        raise SaltCloudException(
            'The show_instnce function must be called with -a or --action.'
        )
    if session is None:
        session = _get_session()
    log.info('Unpausing VM %s', name)
    vm = _get_vm(name, session)
    task = session.xenapi.Async.VM.unpause(vm)
    _run_async_task(task, session)
    return show_instance(name)