BREAKING CHANGES: This commit changes upstream repository naming conventions
to get latest binaries and keys. If you depends on versions of salt from older,
please stick with version 1.x.x of this formula

Modify the `default` suite to use the `saltmajorversion` InSpec input
rather than the `version` variable in `pkgs_spec.rb`.

Use the following command:

```
$ GREP_SED="^\(\s\+master_type: \)true" \
  && grep -rl "${GREP_SED}" test/integration/ \
  | xargs sed -i -e "/${GREP_SED}/s//\1str/"
```

* CVE-2021-25283 enables Jinja2 safe mode, which breaks use of
  `'dict' in x.__class__.__name__` workaround
* Workaround no longer needed as CentOS 6 is EOL