k8s append_hash (#48830)

* Add append_hash functionality to k8s module

append_hash adds a hash based on the contents of a ConfigMap
or Secret to the name - this enables immutable ConfigMaps and
Secrets.

* Provide k8s_config_resource_name plugin

The k8s_config_resource_name filter plugin provides a means of determining
the name of ConfigMaps and Secrets created with append_hash

* Add changelog fragment

* fix failing tests

* Update openshift version needed for append_hash

lib/ansible/modules/clustering/k8s/k8s.py

@@ -89,6 +89,16 @@ options:
         default: no
         type: bool
     version_added: "2.8"
+  append_hash:
+    description:
+    - Whether to append a hash to a resource name for immutability purposes
+    - Applies only to ConfigMap and Secret resources
+    - The parameter will be silently ignored for other resource kinds
+    - The full definition of an object is needed to generate the hash - this means that deleting an object created with append_hash
+      will only work if the same object is passed with state=absent (alternatively, just use state=absent with the name including
+      the generated hash and append_hash=no)
+    type: bool
+    version_added: "2.8"
 
 requirements:
   - "python >= 2.7"