feat(semantic-release): implement for this formula

* 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

pillar.example

@@ -1,3 +1,6 @@
+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
 users-formula:
   use_vim_formula: True
   lookup:  # override the defauls in map.jinja
@@ -7,8 +10,20 @@ users-formula:
 groups:
   foo:
     state: present
-    gid: 500
+    gid: 1500
     system: False
+  badguys:
+    absent: True
+  niceguys:
+    gid: 4242
+    system: False
+    addusers: root
+    delusers: toor
+  ssl-cert:
+    system: True
+    members:
+    - www-data
+    - openldap
 
 users:
   ## Minimal required pillar values
@@ -16,7 +31,6 @@ users:
     fullname: A User
 
   ## Full list of pillar values
-  allow_gid_change: False
   buser:
     fullname: B User
     password: $6$w.............
@@ -35,7 +49,7 @@ users:
     workphone: "(555) 555-5555"
     homephone: "(555) 555-5551"
     manage_vimrc: False
-    allow_gid_change: True
+    allow_gid_change: False
     manage_bashrc: False
     manage_profile: False
     expire: 16426
@@ -61,7 +75,7 @@ users:
     remove_groups: False
     prime_group:
       name: primarygroup
-      gid: 500
+      gid: 1501
     groups:
       - users
     optional_groups:
@@ -138,7 +152,7 @@ users:
 
     google_2fa: True
     google_auth:
-      ssh: |
+      sshd: |
         SOMEGAUTHHASHVAL
         " RESETTING_TIME_SKEW 46956472+2 46991595-2
         " RATE_LIMIT 3 30 1415800560
@@ -158,14 +172,14 @@ users:
       # 'source' allows you to define an arbitrary directory to sync, useful to use for default files.
       # should be a salt fileserver path either with or without 'salt://'
       # if not present, it defaults to 'salt://users/files/user/<username>
-      source: users/files/default
-      template: jinja
+      source: users/files
+      # template: jinja
       # You can specify octal mode for files and symlinks that will be copied. Since version 2016.11.0
       # it's possible to use 'keep' for file_mode, to preserve file original mode, thus you can save
       # execution bit for example.
       file_mode: keep
       # You can specify octal mode for directories as well. This won't work on Windows minions
-      #dir_mode: 775
+      # dir_mode: 775
       sym_mode: 640
       exclude_pat: "*.gitignore"
 
@@ -180,17 +194,3 @@ users:
 absent_users:
   - donald
   - bad_guy
-
-groups:
-  badguys:
-    absent: True
-  niceguys:
-    gid: 4242
-    system: False
-    addusers: root
-    delusers: toor
-  ssl-cert:
-    system: True
-    members:
-    - www-data
-    - openldap