ENG-5471 REVERT BEFORE RELEASE: Sanity check balance partitions by doing a table
scan at the end of each @BalancePartitions call.

This is for catching the bug in ENG-5471. Scan the table for any tuple that's in
the range but not moved.
Merge pull request #943 from VoltDB/ENG-5471

ENG-5471 REVERT BEFORE RELEASE: Sanity check balance partitions