PIM-1439 : Create UT for channel normalizer
PIM-1439 : Add UT for FlatChannelNormalizer
PIM-1439 : UT refactoring creating NormalizerTestCase
PIM-1439 : clean UT and Base class for normalizer UT
UT refactoring for Job Instance normalizer
PIM-1439 : Make UT refactoring
PIM-1439 : Refactor family normalizer UT
PIM-1439 : Refactor Category normalizer UT
PIM-1439 : Refactor attribute normalizers UT