Enable code coverage report in console output

Change the behaviour of tox -e cover to also print the coverage report
to the console, rather than only creating html files that contain the
report. This is a convenience change and should provide a better user
experience.

Change-Id: I10dca81fa600083ec5e0471e88aaa712a1e68bf6

tox.ini

@@ -31,6 +31,7 @@ commands = {posargs}
 
 [testenv:cover]
 commands = python setup.py testr --coverage --testr-args='{posargs}'
+           coverage report
 
 [testenv:debug]
 commands = oslo_debug_helper -t keystoneclient/tests {posargs}