GEODE-6139: Fix problems reported by rat in source release (#413)

GEODE-6139: Fix problems reported by rat in source release (#413)

* GEODE-6139: Fix problems reported by rat in source release
- Add missing license headers to a couple of files
- Tell rat to ignore some trivial config files
- Remove stray tmp file
- Fix cmake file that was badly reformatted
- Fix incorrect assumption in CMakeLists.txt
- .gitignore files use globbing, not regex, so they can't be read into cpack ignore directly

Co-authored-by: Ernest Burghardt <eburghardt@pivotal.io>
Co-authored-by: Mike Martell <mmartell@pivotal.io>
Co-authored-by: Jacob Barrett <jbarrett@pivotal.io>