Sync Log levels from OSLO

Copy changes from just 1 commit:
I0736fd62190fd0b3b26133916f8b3d4d9f0499c2 Default iso8601 logging to warn

Change-Id: I1c90705d4d9b37e5472eeebce0192d4d7aa1febe
Merge "Sync Log levels from OSLO"