Fix misspellings in cinder

Fix misspellings detected by:
* pip install misspellings
* git ls-files | grep -v locale | misspellings -f -

Change-Id: I4780a9cdd4a2aff5a3dbc55c87e93b0972d907db
Closes-Bug: #1257295
Merge "Fix misspellings in cinder"