Fix indentation in a few places so file can be round-tripped more easily (#6178)

with the Python ruamel.yml library

- Change True/False to true/false in a few places so file can
  be more easily round-tripped with the Python ruamel.yml library

roles/download/defaults/main.yml

@@ -21,26 +21,26 @@ kubeadm_images: {}
 # if this is set to true will only download files once. Doesn't work
 # on Container Linux by CoreOS unless the download_localhost is true and localhost
 # is running another OS type. Default compress level is 1 (fastest).
-download_run_once: False
+download_run_once: false
 download_compress: 1
 
 # if this is set to true will download container
-download_container: True
+download_container: true
 
 # if this is set to true, uses the localhost for download_run_once mode
 # (requires docker and sudo to access docker). You may want this option for
 # local caching of docker images or for Container Linux by CoreOS cluster nodes.
 # Otherwise, uses the first node in the kube-master group to store images
 # in the download_run_once mode.
-download_localhost: False
+download_localhost: false
 
 # Always pull images if set to True. Otherwise check by the repo's tag/digest.
-download_always_pull: False
+download_always_pull: false
 
 # Some problems may occur when downloading files over https proxy due to ansible bug
 # https://github.com/ansible/ansible/issues/32750. Set this variable to False to disable
 # SSL validation of get_url module. Note that kubespray will still be performing checksum validation.
-download_validate_certs: True
+download_validate_certs: true
 
 # Use the first kube-master if download_localhost is not set
 download_delegate: "{% if download_localhost %}localhost{% else %}{{ groups['kube-master'][0] }}{% endif %}"