Fix misspellings in os-apply-config

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

Change-Id: I1c54a7bfc353e54e229263ae0e0bd9393917f2db
Closes-Bug: #1257295
Merge "Fix misspellings in os-apply-config"