helm: 'changed' flag takes 'values' in consideration (#332)

Return `changed` `False` is the `values_files` match the `values` of
the existing deployment.

Closes: #274

molecule/default/roles/helm/tasks/tests_chart.yml

@@ -295,6 +295,22 @@
       - install.status.chart == "{{ chart_test }}-{{ chart_test_version }}"
       - "install.status['values'].revisionHistoryLimit == 0"
 
+- name: "Install {{ chart_test }} from {{ source }} with values_files (again)"
+  helm:
+    binary_path: "{{ helm_binary }}"
+    name: test
+    chart_ref: "{{ chart_source }}"
+    chart_version: "{{ chart_source_version | default(omit) }}"
+    namespace: "{{ helm_namespace }}"
+    values_files:
+      - "{{ role_path }}/files/values.yaml"
+  register: install
+
+- name: "Assert the result is consistent"
+  assert:
+    that:
+      - not (install is changed)
+
 - name: Remove helm namespace
   k8s:
     api_version: v1