Revert "Try import_vars"

This reverts commit c5ad341f31.

"import_vars" doesnt exist.

plays/commonlib/vars.yml

@@ -11,7 +11,7 @@
 - name: Load internal system variables
   no_log: true
   when: vars_yml.stat.exists
-  import_vars:
+  include_vars:
     file: "{{ plugin_config_root }}/vars.yml"
 
 - name: Check if the application config file exists
@@ -22,7 +22,7 @@
 - name: Load unencrypted configuration variables
   no_log: true
   when: config_yml.stat.exists
-  import_vars:
+  include_vars:
     file: "{{ app_config_root }}/config.yml"
   register: config_include
 
@@ -34,7 +34,7 @@
 - name: Load application encrypted vault variables
   no_log: true
   when: vault_dir.stat.exists
-  import_vars:
+  include_vars:
     ignore_unknown_extensions: true
     dir: "{{ app_config_root }}/vault"
     extensions: