/** \brief Enable / disable packet generator request
@param client_index - opaque cookie to identify the sender
@param context - sender context, to match reply w/ request
@param is_enabled - 1 if enabling streams, 0 if disabling
@param stream - stream name to be enable/disabled, if not specified handle all streams
*/
/** \brief Enable / disable packet generator request
@param client_index - opaque cookie to identify the sender
@param context - sender context, to match reply w/ request
@param is_enabled - 1 if enabling streams, 0 if disabling
@param stream - stream name to be enable/disabled, if not specified handle all streams
*/