Fix typo in inline documentation for report module

Previously, the inline documentation in
`openstack.common.report.models.with_default_views`
referred to several modules as `openstack.common.views`
when it should have said `openstack.common.report.views`.
This is now rectified.

Change-Id: I151cefce17ebdf83f384bc1cf2e3257bae889877
Merge "Fix typo in inline documentation for report module"