Enable a server:port member of a servicegroup

    CLI Example:

    .. code-block:: bash

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

def servicegroup_server_enable(sg_name, s_name, s_port, **connection_args):
    '''
    Enable a server:port member of a servicegroup

    CLI Example:

    .. code-block:: bash

        salt '*' netscaler.servicegroup_server_enable 'serviceGroupName' 'serverName' 'serverPort'
    '''
    ret = True
    server = _servicegroup_get_server(sg_name, s_name, s_port, **connection_args)
    if server is None:
        return False
    nitro = _connect(**connection_args)
    if nitro is None:
        return False
    try:
        NSServiceGroup.enable_server(nitro, server)
    except NSNitroError as error:
        log.debug('netscaler module error - NSServiceGroup.enable_server() failed: %s', error)
        ret = False
    _disconnect(nitro)
    return ret