Bug 2061 - DropRate and BurstSize swapped - fixed tests

This bug fixes an issue where the dropRate and burst size were swapped in code.
This bug also fixes the unit tests which tested for the bug instead. Made the test use hard-coded constants so inputs matched expected outputs which then caught the bug.

Signed-off-by: Devin Avery <devin.avery@brocade.com>