Attach volume to a server

    CLI Example:

    .. code-block:: bash

        salt minionname cloud.volume_attach my-nova myblock server_name=myserver device='/dev/xvdf'

def volume_attach(provider, names, **kwargs):
    '''
    Attach volume to a server

    CLI Example:

    .. code-block:: bash

        salt minionname cloud.volume_attach my-nova myblock server_name=myserver device='/dev/xvdf'

    '''
    client = _get_client()
    info = client.extra_action(provider=provider, names=names, action='volume_attach', **kwargs)
    return info