start/stop/restart azure webapp (#44498)

* add webapp start/stop/restart

* disable test with facts

* fix lint

* fix lint

* fix check mode

* rename power_action to app_state

* refine names of choices

* fix renaming bug

test/integration/targets/azure_rm_webapp/tasks/main.yml

@@ -22,6 +22,31 @@
     plan: "{{ win_plan_name }}"
   register: output
 
+- name: stop the web app
+  azure_rm_webapp:
+    resource_group: "{{ resource_group }}"
+    name: "{{ win_app_name }}2"
+    plan: "{{ win_plan_name }}"
+    app_state: stopped
+  register: output
+
+- name: assert output changed
+  assert:
+    that:
+      output.changed
+
+# enable after webapp_facts merged
+# - name: get the web app
+#   azure_rm_webapp_facts:
+#     resource_group: "{{ resource_group }}"
+#     name: "{{ win_app_name }}2"
+#   register: stopped
+
+# - name: assert web app is stopped
+#   assert:
+#     that:
+#       - stopped.properties.state == "Stopped"
+
 - name: Create a windows web app with existing app service plan, try to update some root level params
   azure_rm_webapp:
     resource_group: "{{ resource_group }}"
@@ -251,4 +276,4 @@
 
 - name: Assert the web app was created
   assert:
-    that: output.changed
+    that: output.changed