confcontroller: Set sync property in appsink to TRUE
confcontroller: Set sync property in appsink to TRUE

Change-Id: I9b9c92b361f994365d68006eddfc57cc1c0b9b09

shelsonjava/kms-elements,Kurento/kms-elements,Kurento/kms-elements,shelsonjava/kms-elements,TribeMedia/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,Kurento/kms-elements,TribeMedia/kms-elements