Linux install: Set owner to root

[aude]

Previously, files installed to /usr/local/bin/ would be owned by the user executing the command, not root. This change makes these installed files owned by root instead. Improving security is the goal.

I've updated all install references I found, though there might be places I missed. So do tell if you know any I missed.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: aude
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[k8s-ci-robot]

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[minikube-bot]

Can one of the admins verify this patch?

[aude]

Quite discouraging to contribute with this CLA system. I've had no success so far creating an account for the aude@users.noreply.github.com email I used in the commit. I'll see if I can manage to sign it the next few days.

[dlorenc]

Closing, please reopen if you can sign the CLA.

[aude]

I searched the commit log, and found one other recent commit made with a @users.noreply.github.com email address: #2893.

@commitay, it would be super helpful if you'd like to share how you signed the CLA using the email address commitay@users.noreply.github.com.

Other than that, I'm giving it one last go via CNCF helpdesk. Will update this pull request if it's successful.

[aude]

Signed.

[aude]

I've signed the CLA.

To continue this pull request we need to do this:

0. Make sure HEAD in my repo is unchanged from when pull request was closed.
1. Reopen pull request.
2. Change author email.
3. git push --force

Explanation of why: isaacs/github#361

I've done 0. @dlorenc, can you do 1.? Then I'll do 2. and 3.