WSL supports `cloud-init` for provisioning. In some cases (RHEL) this is
enabled. If `wsl-setup` is used on RHEL then there's a TOCTOU between
the check for "no user exists" and the "create user" part as
`cloud-init` creates the user during the prompt.
Let's exit early and assume everything is handled by `cloud-init` *if*
it is enabled.
Signed-off-by: Simon de Vlieger <supakeen@redhat.com>
