In some DBMSs (e.g. MySQL 5.7 (*1)), fractions (millisecond and
microsecond) of DateTime column is not stored by default.
*1: https://dev.mysql.com/doc/refman/5.7/en/date-and-time-type-overview.html
Fix specifying the 'changes-before' values
in the functional test for the 'instance-action-list' command.
Change-Id: I79e80088bcbf559a58aa90a831b54017af310a26
Closes-Bug: #1817064