Revert "Put back change to checksum calculation introduced in 3.0.5"

This reverts commit 6cbe6b307c13c6511254a98ddbb80245689d5d3c.
CORE-1645 Add unit test to verify checksum of update change with where condition.
Merge pull request #209 from adangel/3.0.x

CORE-1645 Checksum changed for update with where clause