member expiration in synchronizator

-checking if member is disabled or expired, if yes, validating/expiring him depending on expiration date (if member is after expiration date, he is expired, if member is before expiration date, he is validated)
Please enhance log message.  "Group synchronization" is too generic. If I see something like this in log I'm even sure if it is problem or not. Also the exception is not part of the log (you need to use '{}' in message.