K3s config.yaml flags not present in node-args annotation

[brandond]

Environmental Info:
K3s Version:
N/A

Node(s) CPU architecture, OS, and Version:
N/A

Cluster Configuration:
N/A

Describe the bug:
From @ibuildthecloud:

I really thought that k3s.io/node-args would have all the config values that came from the config.yaml file. It doesn't. Can it?

Steps To Reproduce:
Install K3s; use configuration from config.yaml instead of on CLI

Expected behavior:
Config from config file present in node-args annotation

Actual behavior:
Only actual CLI flags present in node-args annotation

Additional context / logs:

[ShylajaDevadiga]

Validated in v1.21.1-rc1+k3s1

[centos@ip-172-31-1-111 ~]$ cat /etc/rancher/k3s/config.yaml 
write-kubeconfig-mode: "0644"
tls-san:
  - test
selinux: true
[centos@ip-172-31-1-111 ~]$ kubectl get node ip-172-31-1-111.us-east-2.compute.internal -o yaml|grep args
    k3s.io/node-args: '["server","--write-kubeconfig-mode","0644","--tls-san","test","--selinux","true","--node-external-ip","<redacted>","--datastore-endpoint","********"]'

[brandond]

Reopening to see if @ibuildthecloud wants backports

[brandond]

OK with not backporting.