salt linters complain about these.

```bash
Examining users/googleauth.sls of type state
[201] Trailing whitespace
users/googleauth.sls:9
      - file: {{ users.googleauth_dir }}

[204] Lines should be no longer that 160 chars
users/googleauth.sls:26
    - repl: "auth       [success=done new_authtok_reqd=done default=die]   pam_google_authenticator.so user=root secret={{ users.googleauth_dir }}/${USER}_{{ svc }} echo_verification_code\n@include common-auth"
```

* Based on `ssf-formula` (v0.3.0)
  - https://github.com/myii/ssf-formula/pull/5
* Unable to use `pillar.example` directly for testing
  - Used it as a basis for `test/salt/pillar/default.sls`
  - Brought useful changes back to `pillar.example`
* Fix: avoid `users/googleauth.sls` for `RedHat` & `Suse`
* Close #203

This reverts commit a0392693e3.