salt linters complain about these.

```bash
Examining users/sudo.sls of type state
[201] Trailing whitespace
users/sudo.sls:13
      - file: {{ users.sudoers_dir }}

[201] Trailing whitespace
users/sudo.sls:22
        - name: {{ users.sudoers_file }}
```

```bash
Examining users/init.sls of type state
[206] Jinja variables should have spaces before and after: {{ var_name }}
users/init.sls:176
    - expire: {{ (user['expire'] / 86400) | int}}

[206] Jinja variables should have spaces before and after: {{ var_name }}
users/init.sls:202
      - {{optional_group}}
```

```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"
```

* Semi-automated using `ssf-formula` (v0.5.0)
* Fix errors shown below:

```bash
users-formula$ $(grep "\- yamllint" .travis.yml | sed -e "s:^\s\+-\s\(.*\):\1:")
./users/defaults.yaml
  4:1       warning  missing document start "---"  (document-start)
  5:20      warning  truthy value should be one of [false, true]  (truthy)
  8:21      warning  truthy value should be one of [false, true]  (truthy)
  9:15      warning  truthy value should be one of [false, true]  (truthy)
  10:1      error    too many blank lines (1 > 0)  (empty-lines)

pillar.example
  5:20      warning  truthy value should be one of [false, true]  (truthy)
  14:13     warning  truthy value should be one of [false, true]  (truthy)
  16:13     warning  truthy value should be one of [false, true]  (truthy)
  19:13     warning  truthy value should be one of [false, true]  (truthy)
  23:13     warning  truthy value should be one of [false, true]  (truthy)
  25:5      error    wrong indentation: expected 6 but found 4  (indentation)
  37:23     warning  truthy value should be one of [false, true]  (truthy)
  40:21     warning  truthy value should be one of [false, true]  (truthy)
  41:20     warning  truthy value should be one of [false, true]  (truthy)
  42:13     warning  truthy value should be one of [false, true]  (truthy)
  47:17     warning  truthy value should be one of [false, true]  (truthy)
  51:19     warning  truthy value should be one of [false, true]  (truthy)
  52:23     warning  truthy value should be one of [false, true]  (truthy)
  53:20     warning  truthy value should be one of [false, true]  (truthy)
  54:21     warning  truthy value should be one of [false, true]  (truthy)
  58:15     warning  truthy value should be one of [false, true]  (truthy)
  59:15     warning  truthy value should be one of [false, true]  (truthy)
  73:18     warning  truthy value should be one of [false, true]  (truthy)
  75:20     warning  truthy value should be one of [false, true]  (truthy)
  90:7      error    duplication of key "privkey" in mapping  (key-duplicates)
  91:7      error    duplication of key "pubkey" in mapping  (key-duplicates)
  117:44    warning  too few spaces before comment  (comments)
  125:27    warning  truthy value should be one of [false, true]  (truthy)
  153:17    warning  truthy value should be one of [false, true]  (truthy)
  167:13    warning  truthy value should be one of [false, true]  (truthy)
  171:16    warning  truthy value should be one of [false, true]  (truthy)
  172:89    error    line too long (102 > 88 characters)  (line-length)
  177:89    error    line too long (102 > 88 characters)  (line-length)
  178:89    error    line too long (100 > 88 characters)  (line-length)
  181:89    error    line too long (94 > 88 characters)  (line-length)
  188:13    warning  truthy value should be one of [false, true]  (truthy)
  189:12    warning  truthy value should be one of [false, true]  (truthy)
  190:12    warning  truthy value should be one of [false, true]  (truthy)

test/salt/pillar/default.sls
  25:89     error    line too long (91 > 88 characters)  (line-length)
  175:89    error    line too long (102 > 88 characters)  (line-length)
  180:89    error    line too long (102 > 88 characters)  (line-length)
  181:89    error    line too long (100 > 88 characters)  (line-length)
  184:89    error    line too long (94 > 88 characters)  (line-length)
```

* 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

* Close #198
* All details in that issue
* Solution based upon:
  - https://github.com/saltstack-formulas/vault-formula/pull/35#issuecomment-509854411

This fixes a change introduced by 634deac where createhome was changed from True to False (by default).

This change honnor the default "global default" "users.createhome" from defaults.sls

using `|json` would let the state get an error if gid is a string, as it would
not be converted.

Using directly the `None` yaml value, and letting numbers as string be
converted by yaml parser.

members, addusers, delusers, and in pillar examples

Also remove warning for passing unknown arguments on group.absent

To get it to work with RHEL7 with salt 2018.x

The former is deprecated since Carbon.

Since https://github.com/saltstack-formulas/users-formula/pull/182 the
home directory was created by salt which prevent "adduser" behavior to
copy /etc/skel in newly created directory.

Ensure the parent directory of the home dir is existing instead.

Fixes #181

The state will not fail gracefully, instead you will get
an error like this one:

          ID: users_rhertzog_user_gitconfig_0
    Function: git.config_set
        Name: alias.br
      Result: False
     Comment: State 'git.config_set' was not found in SLS 'users'
              Reason: 'git' __virtual__ returned False
     Changes:

And since pillar data can't be (easily) tuned according to minion's
status, we really need this check here.

My tests with Salt 2017.7.3 have shown that cmd.has_exec() is reliable
for this, contrary the what the comment was implying.

* Add support for 'template' in 'user_files'

* Fix-up wrong nesting level for template value

* Small quality improvement for push upstream.

* Consistency improvement for variable name

This reverts commit 48416398e3.