[FIXED JENKINS-6446] added global configurations for all the six types of unittest changes (increase or descrease of passed, failed and skipped tests)

Given default values are:
* Passing test
- added: +1
- removed: 0
* Failing test
- added: -1
- removed: 0
* Skipped test (no marks given or reduced)
- added: 0
- removed: 0

The configuration is available under 'Continuous integration game - Unit Tests' section in advanced mode.

If you could review this and see whether this can be incorporated or provide more input; it will be helpful.