Check if a server:port combination is in state UP in a servicegroup

    CLI Example:

    .. code-block:: bash

        salt '*' netscaler.servicegroup_server_up 'serviceGroupName' 'serverName' 'serverPort'

def servicegroup_server_up(sg_name, s_name, s_port, **connection_args):
    '''
    Check if a server:port combination is in state UP in a servicegroup

    CLI Example:

    .. code-block:: bash

        salt '*' netscaler.servicegroup_server_up 'serviceGroupName' 'serverName' 'serverPort'
    '''
    server = _servicegroup_get_server(sg_name, s_name, s_port, **connection_args)
    return server is not None and server.get_svrstate() == 'UP'