Yamllint fixes (#4410)

* Lint everything in the repository with yamllint

* yamllint fixes: syntax fixes only

* yamllint fixes: move comments to play names

* yamllint fixes: indent comments in .gitlab-ci.yml file

contrib/dind/group_vars/all/all.yaml

@@ -1,2 +1,3 @@
+---
 # See distro.yaml for supported node_distro images
 node_distro: debian

contrib/dind/group_vars/all/distro.yaml

@@ -1,3 +1,4 @@
+---
 distro_settings:
   debian: &DEBIAN
     image: "debian:9.5"

contrib/dind/kubespray-dind.yaml

@@ -1,3 +1,4 @@
+---
 # kubespray-dind.yaml: minimal kubespray ansible playbook usable for DIND
 # See contrib/dind/README.md
 kube_api_anonymous_auth: true

contrib/dind/roles/dind-cluster/tasks/main.yaml

@@ -1,3 +1,4 @@
+---
 - name: set_fact distro_setup
   set_fact:
     distro_setup: "{{ distro_settings[node_distro] }}"
@@ -33,7 +34,7 @@
       # Delete docs
       path-exclude=/usr/share/doc/*
       path-include=/usr/share/doc/*/copyright
-    dest:  /etc/dpkg/dpkg.cfg.d/01_nodoc
+    dest: /etc/dpkg/dpkg.cfg.d/01_nodoc
   when:
     - ansible_os_family == 'Debian'
 
@@ -55,7 +56,7 @@
   user:
     name: "{{ distro_user }}"
     uid: 1000
-    #groups: sudo
+    # groups: sudo
     append: yes
 
 - name: Allow password-less sudo to "{{ distro_user }}"

contrib/dind/roles/dind-host/tasks/main.yaml

@@ -1,3 +1,4 @@
+---
 - name: set_fact distro_setup
   set_fact:
     distro_setup: "{{ distro_settings[node_distro] }}"
@@ -18,7 +19,7 @@
     state: started
     hostname: "{{ item }}"
     command: "{{ distro_init }}"
-    #recreate: yes
+    # recreate: yes
     privileged: true
     tmpfs:
       - /sys/module/nf_conntrack/parameters