test(pillar): add test pillar to generate `.vimrc` file

test/salt/pillar/default.sls

@@ -2,7 +2,6 @@
 # vim: ft=yaml
 ---
 users-formula:
-  use_vim_formula: true
   lookup:  # override the defauls in map.jinja
     root_group: root
 

test/salt/pillar/vimrc.sls

+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
+users-formula:
+  use_vim_formula: true
+
+users:
+  ## Minimal required pillar values
+  vim_user:
+    fullname: Vim User
+    manage_vimrc: true