V3.0 Scheduling feature functionality

New Features

• Added flexible scheduling feature variants with following options:
  • 'start' : Optional: Format: e.g., "20180207 00:00:00"
  • 'end' : Optional. Format: e.g., "20180207 00:00:00"
  • 'enabled' : Required. a list of variants with percentage.

   e.g.,
        'bid_caching'=> array( // feature flag name
            // default variants block wich wil be overriden by scheduled variants when scheduling is active
            'enabled' => array(
                'empty_only'=>90
            ),
 
            // scheduling config will override the above default enabled variants
            'scheduled' => array(
                'start' => 20180206, // schedule start date
                'end'   => 20180207, // schedule end date; Optional;
                'enabled' =>array(  //  a list of variants to override
                    'test' => 100
                )
            )
        )