performance/write-behind: fine-tune logic of wb_mark_winds

- remove wb_mark_wind_aggregegate_size_aware, since wb_mark_wind_all does
    the same work (with check for whether current aggregated data size is
    greater than the configured limit before calling it). Moreover,
    wb_mark_wind_aggregate_size_aware called __wb_get_aggregate_size
    redundantly, thereby reducing the performance, since for small
    sized large number of writes, traversing the list of requests takes
    significant amount of time.

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 276 (write behind needs to be optimized.)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=276

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