fix misspellings in logs, comments and tests

Flagged with: https://github.com/lyda/misspell-check
Run with: git ls-files | misspellings -f -

Fixes bug: 1100083
Change-Id: Icf1f844fea8ad0a1101d1dc64b9a126608e9536e
Replace use of mkdtemp with fixtures.TempDir

Change-Id: I392b2cc14f27a099fecad3e15d3f14b269c1f621
Merge "Replace use of mkdtemp with fixtures.TempDir"
Merge "fix misspellings in logs, comments and tests"