[Release-1.21] etcd-snapshot loading config fails with "flag provided but not defined: -profile"

[dereknola]

This is a backport issue for #2103

Environmental Info:
RKE2 Version:
rke2 version v1.21.6+rke2r1 (b915fc9)
go version go1.16.6b7

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

Cluster Configuration:
N/A

Describe the bug:
Running the etcd-snapshot commands throw an error flag provided but not defined: -profile.

Steps To Reproduce:
Have the profile set in the config file and run the etcd-snapshot which loads the default config.

Expected behavior:
Runs snapshot.

Actual behavior:
Throw error saying flag profile is not defined.

[VestigeJ]

Issue validated

RKE2 skipped over unknown flags inside of the config.yaml, etcd-snapshot correctly uploaded to an S3 bucket.

$ rke2 -v

rke2 version v1.21.7-rc2+rke2r1 (de8b499743b19a5a703f0bc26aea9c6fdabc3874)
go version go1.16.10b7

$ sestatus

SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             targeted
Current mode:                   enforcing
Mode from config file:          enforcing
Policy MLS status:              enabled
Policy deny_unknown status:     allowed
Memory protection checking:     actual (secure)
Max kernel policy version:      31

$ cat /etc/rancher/rke2/config.yaml

write-kubeconfig-mode: "0644"
tls-san:
  - "foot1.local"
node-label:
  - "key=valued"
  - "crisis=averted"
etcd-expose-metrics: true
etcd-snapshot-name: "vertabular"
etcd-snapshot-schedule-cron: "*/22****"
etcd-snapshot-retention: 7
etcd-snapshot-dir: /home/ubuntu/
profile: cis-1.6
etcd-s3: true
etcd-s3-bucket: "justin-validation-bucket"
etcd-s3-region: "us-north-9"
etcd-s3-endpoint: "s3.us-north-9.amazonaws.com"
etcd-s3-access-key: "***************"
etcd-s3-secret-key: "*************"

$ sudo /usr/local/bin/rke2 etcd-snapshot

WARN[0000] Unknown flag --write-kubeconfig-mode found in config.yaml, skipping 
WARN[0000] Unknown flag --tls-san found in config.yaml, skipping 
WARN[0000] Unknown flag --node-label found in config.yaml, skipping 
WARN[0000] Unknown flag --node-label found in config.yaml, skipping 
WARN[0000] Unknown flag --etcd-expose-metrics found in config.yaml, skipping 
WARN[0000] Unknown flag --etcd-snapshot-name found in config.yaml, skipping 
WARN[0000] Unknown flag --etcd-snapshot-schedule-cron found in config.yaml, skipping 
WARN[0000] Unknown flag --etcd-snapshot-retention found in config.yaml, skipping 
WARN[0000] Unknown flag --etcd-snapshot-dir found in config.yaml, skipping
WARN[0000] Unknown flag --profile found in config.yaml, skipping  
INFO[0000] Managed etcd cluster bootstrap already complete and initialized 
...
...
...
INFO[0000] Saving etcd snapshot on-demand-ip-15-5-55-55.us-north-9.compute.internal-5555 to S3 
INFO[0000] Checking if S3 bucket justin-validation-bucket exists 
INFO[0000] S3 bucket justin-validation-bucket exists    
INFO[0001] S3 upload complete for on-demand-ip-15-5-55-55.us-north-9.compute.internal-5555 
INFO[0001] Saving current etcd snapshot set to rke2-etcd-snapshots ConfigMap