Also:

* add keyring file for the salt repo, due to `apt-key` deprecation
* remove old repository file

Use the following command:

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

```
Offenses:

test/integration/v3000-py2/controls/pkgs_spec.rb:10:5: C: [Correctable]
Style/WordArray: Use ['Salt Minion'] for an array of words.
(https://rubystyle.guide#percent-w)
    %w[Salt\ Minion]
    ^^^^^^^^^^^^^^^^
test/integration/v3000-py3/controls/pkgs_spec.rb:10:5: C: [Correctable]
Style/WordArray: Use ['Salt Minion'] for an array of words.
(https://rubystyle.guide#percent-w)
    %w[Salt\ Minion]
    ^^^^^^^^^^^^^^^^
test/integration/v3001-py3/controls/pkgs_spec.rb:10:5: C: [Correctable]
Style/WordArray: Use ['Salt Minion'] for an array of words.
(https://rubystyle.guide#percent-w)
    %w[Salt\ Minion]
    ^^^^^^^^^^^^^^^^
test/integration/v3002-py3/controls/pkgs_spec.rb:10:5: C: [Correctable]
Style/WordArray: Use ['Salt Minion'] for an array of words.
(https://rubystyle.guide#percent-w)
    %w[Salt\ Minion]
    ^^^^^^^^^^^^^^^^
test/integration/v3003-py3/controls/pkgs_spec.rb:10:5: C: [Correctable]
Style/WordArray: Use ['Salt Minion'] for an array of words.
(https://rubystyle.guide#percent-w)
    %w[Salt\ Minion]
    ^^^^^^^^^^^^^^^^

19 files inspected, 5 offenses detected, 5 offenses auto-correctable
```

* Automated using https://github.com/myii/ssf-formula/pull/335

Use the following command:

```
$ GREP_SED="\(repo\.salt\)stack\.com" \
  && grep -rl --exclude-dir=.git "${GREP_SED}" \
  | grep -v .un~$ \
  | xargs sed -i -e "/${GREP_SED}/s//\1project.io/g"
```

* Automated using https://github.com/myii/ssf-formula/pull/302

```
$ GREP_SED="\(pkgrepo: deb http\):" \
  && grep -rl "${GREP_SED}" test/integration/v* \
     | xargs sed -i -e "/${GREP_SED}/s//\1s:/"
```

* 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

* Automated using https://github.com/myii/ssf-formula/pull/296

* Automated using https://github.com/myii/ssf-formula/pull/293

* Automated using https://github.com/myii/ssf-formula/pull/292

* Semi-automated using https://github.com/myii/ssf-formula/pull/285

* Semi-automated using https://github.com/myii/ssf-formula/pull/269

* Semi-automated using https://github.com/myii/ssf-formula/pull/230

* https://travis-ci.org/github/myii/salt-formula/jobs/692337807#L2366-L2381
  - `opensuse` now has `3000.3` available
* Simplification is useful anyway, even without this (could still use `case`)

* https://docs.saltstack.com/en/latest/topics/releases/3000.3.html
* https://docs.saltstack.com/en/latest/topics/releases/2019.2.5.html

* Semi-automated using https://github.com/myii/ssf-formula/pull/135