[Feature Request] Support K3s/RKE option `--data-dir`

[cloudymax]

Describe the feature you'd like, and why

K3s and other SUSe k8s distros accept the option --data-dir which allows a user to specify an alternative location for k3s data to be stored (replaces /var/lib/rancher)

• https://docs.k3s.io/cli/server

Currently, when we connect new nodes to the cluster, we check the default location even if data-dir has been specified under k8s_distros.k3s.k3s_yaml.data-dir in the config file. this leads to the following error when attaching a new node:

 > cat: /var/lib/rancher/k3s/server/node-token: No such file or directory

Describe alternatives you've considered, if any

This can sort-of be worked around by specifying a new storage class for local-path provisioned that points tot he desired directory but that will still leave the core k3s components installed to /var/lib/rancher which can cause unexpected disk-pressure issues.