Moved tests for general utils out of vanilla package

test_utils are used by tests for general code. They should not be in 'vanilla' package.
The next logical step is to split "tests for utils" and "utils for tests".
But at least tests better reflect to objects structure now.

Change-Id: I0adb77d8c55893ae74eb4a73dd7fb69c82ebe9bb
Merge "Moved tests for general utils out of vanilla package"