Fix misspellings

The patch takes those proposed changes from
https://review.openstack.org/#/c/71785 that can go in.

Additionally, rename a file to fix the typo in its filename.

Change-Id: I690530ee6d8b5b8b2995223d77b156277f304d8e
Co-Authored-By: Shane Wang <shane.wang@intel.com>
Merge "Fix misspellings"