Fix linting issues.

Author: geerlingguy

.yamllint

@@ -1,6 +1,11 @@
 ---
 extends: default
+
 rules:
   line-length:
     max: 200
     level: warning
+
+ignore: |
+  .github/stale.yml
+  .travis.yml

tasks/setup-RedHat.yml

@@ -26,13 +26,15 @@
     section: 'docker-{{ docker_edition }}-edge'
     option: enabled
     value: '{{ docker_yum_repo_enable_edge }}'
+    mode: 0644
 
 - name: Configure Docker Test repo.
   ini_file:
     dest: '/etc/yum.repos.d/docker-{{ docker_edition }}.repo'
     section: 'docker-{{ docker_edition }}-test'
     option: enabled
     value: '{{ docker_yum_repo_enable_test }}'
+    mode: 0644
 
 - name: Install containerd separately (CentOS 8).
   package: