Improve SyncUserProcessor#interest method

[long187]

SyncUserProcessor#interest method used to determine if the message is process by this Processor, this method return a String, bolt framework matches the message class name with this String, if it matches, this message will be processed, this way is a bit inflexible. For example, the user has a BaseMassage, and the subclass of BaseMessage is processed by this Processor.

So, if the SyncUserProcessor#interest method returns a boolean type and the framework pass the message type as a parameter, let the user decide if the message type can be processed, if it can, return true, otherwise return false, it will be more flexible.