Remove omit from template resource (#432) (#443)

[backport/2.3] Remove omit from template resource (#432)

Depends-On: #446
Remove omit value from template args
SUMMARY
While defining resource using template parameter, the code does not remove the omit value if any.
This fix adds a post process to remove any omit value from the resource definition.
fixes #431
ISSUE TYPE
Bugfix Pull Request
COMPONENT NAME
k8s*
Reviewed-by: Mike Graves mgraves@redhat.com
Reviewed-by: Abhijeet Kasurde 
(cherry picked from commit 882e672)

tests/integration/targets/k8s_template/tasks/main.yml

@@ -239,6 +239,63 @@
           - resource.result.results | selectattr('changed') | list | length == 1
           - resource.result.results | selectattr('error', 'defined') | list | length == 1
 
+    # Test resource definition using template with 'omit'
+    - name: Deploy configmap using template
+      k8s:
+        namespace: "{{ template_namespace }}"
+        name: test-data
+        template: configmap.yml.j2
+
+    - name: Read configmap created
+      k8s_info:
+        kind: configmap
+        namespace: "{{ template_namespace }}"
+        name: test-data
+      register: _configmap
+
+    - name: Validate that the configmap does not contains annotations
+      assert:
+        that:
+          - '"annotations" not in _configmap.resources.0.metadata'
+
+    - name: Create resource once again
+      k8s:
+        namespace: "{{ template_namespace }}"
+        name: test-data
+        template: configmap.yml.j2
+      register: _configmap
+
+    - name: assert that nothing changed
+      assert:
+        that:
+          - _configmap is not changed
+
+    - name: Create resource once again (using description)
+      k8s:
+        namespace: "{{ template_namespace }}"
+        name: test-data
+        template: configmap.yml.j2
+      register: _configmap
+      vars:
+        k8s_configmap_desc: "This is a simple configmap used to test ansible k8s collection"
+
+    - name: assert that configmap was changed
+      assert:
+        that:
+          - _configmap is changed
+
+    - name: Read configmap created
+      k8s_info:
+        kind: configmap
+        namespace: "{{ template_namespace }}"
+        name: test-data
+      register: _configmap
+
+    - name: Validate that the configmap does not contains annotations
+      assert:
+        that:
+          - _configmap.resources.0.metadata.annotations.description == "This is a simple configmap used to test ansible k8s collection"
+
   always:
     - name: Remove namespace (Cleanup)
       kubernetes.core.k8s:

tests/integration/targets/k8s_template/templates/configmap.yml.j2

@@ -0,0 +1,7 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+    annotations:
+        description: "{{ k8s_configmap_desc | default(omit) }}"
+data:
+    key: "testing-template"