Increase the unit tests coverage for recent code:
validation, group and logs classes.
(Increase of 54 unit tests)
Move per action files into one test file:
test_validation_actions
Change-Id: I7a1a8b0681c13ebd758a5686b2398a0a9e87a4eb
Create two classes for Log and Logs in order to get
a simpler representation of the validation Log and
provide easy way to manage the log data informations
Change-Id: I743355cef943e43492264d4c4700bebbeab9a37d
