Improve tox to show coverage results

This patch will improve tox -e cover when it will be run a summary of
coverage report will be shown afterwards.

Change-Id: I5d10a4ec756dcfea74dfb2bc3d43893caf3f6b26

tox.ini

@@ -81,6 +81,7 @@ commands = {[testenv:bandit]commands}
 
 [testenv:cover]
 commands = python setup.py testr --coverage --testr-args='{posargs}'
+           coverage report
 
 [testenv:cover-constraints]
 install_command = {[testenv:common-constraints]install_command}