Altered root user check for vm-driver=none

[WurmNL]

Altered current user check to use user.Username as some distro's don't have the "Name" set. This caused me to "add" root to the root user on ArchLinux:

root:x:0:0:thiscanbeanything:/root:/bin/bash

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: WurmNL
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[minikube-bot]

Can one of the admins verify this patch?

[afbjorklund]

Same as #4995 - not sure why that was "merged" with the Windows changes though ? @blueelvis ?

As per the earlier reports, we might want to check for UID 0 rather than testing the login name...

[blueelvis]

@afbjorklund - #4995 hasn't been merged. medya closed it in favor of #4745. I am still working on fixing those integration test issues. Details in there. Once that is merged, all of these issues would be fixed.

[afbjorklund]

Just saying that I think we should fix this one-liner first, and do those unrelated changes later.

WDYT @medyagh

[tstromberg]

Update this to check that u.Uid is 0 instead. Naming a user "root" should not confer any special powers.

[tstromberg]

I'm OK if this gets merged in first, so long as it is checking the correct field (uid).

[RA489]

@minikube-bot OK to test

[tstromberg]

Obsoleted by #5179 - thank you for bringing this to our attention!