In fix for BUG#15872, a condition of type "t.key NOT IN (c1, .... cN)"
where N>1000, was incorrectly converted to
  (-inf < X < c_min) OR (c_max < X)
Now this conversion is removed, we dont produce any range lists for such
conditions.


mysql-test/r/range.result:
  BUG#21282: Testcase
mysql-test/t/range.test:
  BUG#21282: Testcase
sql/opt_range.cc:
  BUG#21282: Incorrect query results for "t.key NOT IN (<big const list>) 
  In fix for BUG#15872, a condition of type "t.key NOT IN (c1, .... cN)"
  where N>1000, was incorrectly converted to 
    (-inf < X < c_min) OR (c_max < X)
  Now this conversion is removed, we dont produce any range lists for such
  conditions.