Unless there are comments, I will commit this in 48 hours. (sitting for nearly 7 days)
FLUME-273: RollSink should expose ability to configure SizeTrigger
Review Request #1833 - Created June 19, 2011 and submitted
Adds a 'trigger' kw arg that can take 'time' or 'size(n)' as arguments, and then wires them in so users can have file rolls based on time (default) or time-or-aggregate-event-size. (SizeTrigger existed for unit testing previously, and didn't happen earlier due to args with subargs).
New tests exercise parsing and functionally exercise size triggers. Tests (except for some flakies) pass.