Convert files to use _LE and friends

LOG.warn etc. should be translated separately and thus messages need to
be marked with _LW for LOG.warn, _LI for LOG.info and _LE for LOG.errors
and LOG.exception.

Mark all LOG invocations with proper translation marker.

Use ',' instead of '%' when adding variables to log messages to allow
lazy evaluation.

Add new hacking checks for these.

Change-Id: I31d3ee50f30c63d7d647b1c2b1eae50bf96f0c74