Change tox.ini coverage to always generate html
Change tox.ini coverage to always generate html

This patch changes the order of the tox "cover" task to always generate
the html report. Prior to this patch if the coverage failed the test
threshold it would abort before the html version was created.

Change-Id: Ie1108a8b655faec33906b6be4b4932ff8beb5994

openstack/octavia,openstack/octavia,openstack/octavia