to estimate correctly cost of full table scan we should take into
account rows read and skipped on each iteration.


mysql-test/r/distinct.result:
  Fixed test suite: now full scan is used
  less often
mysql-test/r/join_outer.result:
  Fixed test suite: now full scan is used
  less often
mysql-test/r/select_safe.result:
  Fixed test suite: now full scan is used
  less often