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/plugins/filter/k8s.py

@@ -0,0 +1,40 @@
+# Copyright (c) 2017 Ansible Project
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+
+ANSIBLE_METADATA = {
+    'metadata_version': '1.1',
+    'status': ['preview'],
+    'supported_by': 'community'
+}
+
+
+try:
+    from openshift.helper.hashes import generate_hash
+    HAS_GENERATE_HASH = True
+except ImportError:
+    HAS_GENERATE_HASH = False
+
+from ansible.errors import AnsibleFilterError
+
+
+def k8s_config_resource_name(resource):
+    if not HAS_GENERATE_HASH:
+        raise AnsibleFilterError("k8s_config_resource_name requires openshift>=0.7.2")
+    try:
+        return resource['metadata']['name'] + '-' + generate_hash(resource)
+    except KeyError:
+        raise AnsibleFilterError("resource must have a metadata.name key to generate a resource name")
+
+
+# ---- Ansible filters ----
+class FilterModule(object):
+
+    def filters(self):
+        return {
+            'k8s_config_resource_name': k8s_config_resource_name
+        }