Fix comment in tearDown()

This minor change fixes two typos in the tearDown() method.

Change-Id: Ie99c671cbfdaed01715046ea65d49e09114b1e08
Remove cinderclient/tests from coverage report

Currently coverage reports on coverage of the tests themselves. This
makes the percentage coverage higher than if they are excluded and
therefore distorts the reports values for the codes as a whole.

This commit updates the .coveragerc files to remove
cinderclient/tests/* from the coverage report.

Change-Id: If7f1765017f3f0d55975219b12ff7bf149146931
Merge "Remove cinderclient/tests from coverage report"
Merge "Fix comment in tearDown()"