File upload expiration

From time to time it is required to remove expired file to make place for new uploads. This is done by the expiration task.

Available properties:

expiration-time
How long the server will keep uploaded files. Value in Java Period format (default: P30D - 30 days)
period
How often the server should look for expired files to remove. Value in Java Period format (default: P1D - 1 day)
delay
Time since server start up before the server should look for expired files to remove. Value in Java Period format (default: 0)
limit
Maximum number of files to remove during a single execution of expiration. (default: 10000)