Validations logging now has several documented fallbacks.
constants.py now includes constant default path,
in order to improve readability and provide reference.
Tests are included.
Complementary patch for validations_commons callbacks
is optional, as the behavior should stay largely the same.
Co-Authored-By: mbu <mat.bultel@gmail.com>
Change-Id: Iab5f246f22fa6998ea6cec578eec6ebb5de13ad4
f2830c5244