Rename 'finishTest' to 'finishIndividualTest'

This change renames 'finishTest' to 'finishIndividualTest' to avoid
any confusion with already existing 'finish' handler. And also
added comment describing finishIndividualTest.
Merge pull request #5 from NVIDIA/apatole-dev

Rename 'finishTest' to 'finishIndividualTest'