Normalize bools in tests. (#589)

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

@@ -43,9 +43,9 @@
     docker_container:
       name: "{{ item }}"
       state: absent
-      force_kill: yes
+      force_kill: true
     with_items: "{{ cnames }}"
-    diff: no
+    diff: false
   - name: "Make sure all images are removed"
     docker_image:
       name: "{{ item }}"
@@ -55,9 +55,9 @@
     docker_network:
       name: "{{ item }}"
       state: absent
-      force: yes
+      force: true
     with_items: "{{ dnetworks }}"
-    diff: no
+    diff: false
 
   when: docker_api_version is version('1.25', '>=')