Fix ensure log_config is absent regression

This fixes a regression what was introduced
with the minor refactoring patch
(79c5bbba98458d2e7db80d0797b6b7991703cb7a).

W/o this patch nova, cinder and ceilometer would not be
re-configured, if debug=true was re-set in astute.yaml

Change-Id: I6b00646893eee27d35e5d1c67c0082d6f8dc0029
Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
Merge "Fix ensure log_config is absent regression" into stable/4.1