[BUG] FATA[0000] stat /root/.ssh/id_rsa: no such file or directory just use password to create cluster

[631068264]

Describe the bug

[root@Server-c49a7057-d19d-4676-bafa-e7729889c6fa ~]# /usr/local/bin/autok3s create --provider native --cluster --name test --k3s-install-script '-k http://xxxx/install.sh' --k3s-version v1.19.5+k3s2 --ssh-user root --ssh-password xxx --ssh-port 22  --master-extra-args '--docker' --master-ips xxxx

FATA[0000] stat /root/.ssh/id_rsa: no such file or directory 

To reproduce
My machine don't have /root/.ssh/id_rsa this file . Because I just use password to connect the node， I don't why I should have a private key.

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Environments (please complete the following information):

• OS: centos7
• AutoK3s Version
  Version: {"gitVersion":"v0.4.6","gitCommit":"4537e6ee2aea8b204a72f7b6c377edb154f7c058","gitTreeState":"","buildDate":"2021-12-28T04:15:30Z","goVersion":"go1.16.2","compiler":"gc","platform":"linux/amd64"}

Additional context
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[Jason-ZW]

this commit will fix the bug.