Reduce pending update flush contention for container listings

Registered by Aaron Schulz on 2013-10-04

Instead of always flushing the pending update log in list_objects_iter(), check if there is a prefix parameter, and if so, only flush if:
(a) The log file reached a size threshhold (similar to the PUT logic) or an age threshhold
(b) The log file has an entry where 'obj'=<some value with the prefix> (a flush is required for correctness)
I think this could reduce the contention/frequency of flushing (and cause less fsync()) when listings are frequent.

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