It has been discussed that there really isn't much point in having
unit tests making any kind of logger calls. Some usage has already
been cleaned up. This patch removes the remaining instances of log
calls under the cinder/tests directory.
Also cleaned up a lot of cases where the source files would import
oslo_logging and declare a LOG variable which was never actually
used.
Leaving logging in the cinder/tests/unit/integrated tree for now
until a plan is decided as to what to do with all of these type of
tests.
Added hacking check to prevent new instances from slipping by code
reviews.
Change-Id: If177394486d5c92fa5466cd3825b15d30cf5fb18