Disallow log hints in LOG.debug

Currently LOG.debug(_(...)) is disallowed but not LOG.debug(_Lx(...)).
This change disallows all log hints in LOG.debug calls.

Change-Id: I9758ad4ca9f7e8534abf38f5064b01b0c353e904
Partial-bug: #1320867
Merge "Disallow log hints in LOG.debug"