UP-3670 Fix data-import build options

Pass valid args to maven command
Use filters file for database config
UP-3668 Allow aggregator to inspect event

Add API to allow aggregator to determine if it supports aggregation of the actual
event instead of just the event type
Fix bad class name reference in docs
UP-3669 Reduce potential sources of flushing

During event aggregation no event flushing should occure, this change
should prevent any hibernate data flush until the aggregation block
is complete