tests: Remove unnecessary warnings filter
tests: Remove unnecessary warnings filter

...and fix formatting for others.

Change-Id: I8e0973640f89b915185c419c2c3a09cc5c286a02
Signed-off-by: Stephen Finucane <4725dc7f3632bf126d9fbdc30c347e91e8d2fe16@redhat.com>

openstack/nova,mahak/nova,openstack/nova,mahak/nova,openstack/nova,mahak/nova