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

tests/files/gce_rhel7-cilium.yml

+---
 # Instance settings
 cloud_image_family: rhel-7
 cloud_region: us-central1-b

tests/files/gce_rhel7-weave.yml

+---
 # Instance settings
 cloud_image_family: rhel-7
 cloud_region: us-central1-b

tests/files/gce_ubuntu-canal-ha.yml

+---
 # Instance settings
 cloud_image_family: ubuntu-1604-lts
 cloud_region: us-central1-b

tests/files/gce_ubuntu-canal-kubeadm.yml

+---
 # Instance settings
 cloud_image_family: ubuntu-1604-lts
 cloud_machine_type: "n1-standard-1"

tests/files/gce_ubuntu-cilium-sep.yml

+---
 # Instance settings
 cloud_image_family: ubuntu-1604-lts
 cloud_region: us-central1-b
@@ -9,4 +10,3 @@ deploy_netchecker: true
 enable_network_policy: true
 dns_min_replicas: 1
 cloud_provider: gce
-

tests/files/gce_ubuntu-contiv-sep.yml

+---
 # Instance settings
 cloud_image_family: ubuntu-1604-lts
 cloud_region: us-central1-b

tests/files/gce_ubuntu-flannel-ha.yml

+---
 # Instance settings
 cloud_image_family: ubuntu-1604-lts
 cloud_region: us-central1-b

tests/files/gce_ubuntu-kube-router-sep.yml

+---
 # Instance settings
 cloud_image_family: ubuntu-1604-lts
 cloud_region: us-central1-c

tests/files/gce_ubuntu-rkt-sep.yml

+---
 # Instance settings
 cloud_image_family: ubuntu-1604-lts
 cloud_region: us-central1-c

tests/files/gce_ubuntu-weave-sep.yml

+---
 # Instance settings
 cloud_image_family: ubuntu-1604-lts
 cloud_region: us-central1-c

tests/files/gce_ubuntu18-flannel-aio.yml

+---
 # Instance settings
 cloud_image_family: ubuntu-1804-lts
 cloud_region: us-central1-a

upgrade-cluster.yml

@@ -65,8 +65,8 @@
     - { role: kubespray-defaults}
     - { role: etcd, tags: etcd, etcd_cluster_setup: false }
 
-#Handle upgrades to master components first to maintain backwards compat.
-- hosts: kube-master
+- name: Handle upgrades to master components first to maintain backwards compat.
+  hosts: kube-master
   any_errors_fatal: "{{ any_errors_fatal | default(true) }}"
   serial: 1
   roles:
@@ -79,8 +79,8 @@
     - { role: upgrade/post-upgrade, tags: post-upgrade }
   environment: "{{proxy_env}}"
 
-#Upgrade calico on all masters and nodes
-- hosts: kube-master:kube-node
+- name: Upgrade calico on all masters and nodes
+  hosts: kube-master:kube-node
   any_errors_fatal: "{{ any_errors_fatal | default(true) }}"
   serial: "{{ serial | default('20%') }}"
   roles:
@@ -89,8 +89,8 @@
     - { role: kubernetes-apps/network_plugin, tags: network }
     - { role: kubernetes-apps/policy_controller, tags: policy-controller }
 
-#Finally handle worker upgrades, based on given batch size
-- hosts: kube-node:!kube-master
+- name: Finally handle worker upgrades, based on given batch size
+  hosts: kube-node:!kube-master
   any_errors_fatal: "{{ any_errors_fatal | default(true) }}"
   serial: "{{ serial | default('20%') }}"
   roles: