fixes #12659, use absolute path when tilde is used in front of path for ssh-key

[marcvelasco]

Fixes #12659 , when using a relative path with ~ the path would not be recognized correctly if used with an equal sign.

Behavior is as currently working in GO per golang/go#4140

Solution here is to use the user home directory and joining to the relative path when a relative path is used like: minikube -p test start --driver=ssh --ssh-key=~/.ssh/id_rsa --ssh-ip-address=mytestkube

Let me know if any comments or suggested changes, thanks!

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Hi @marcvelasco. Thanks for your PR.

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