remove kvm hidden state from KVM domain spec

[markllama]

This change removes a KVM feature spec that is not present and will not be in CentOS or RHEL.
The presence of this section prevented minikube from starting in KVM on those hosts.

This prior commit introduced the feature spec, breaking CentOS and RHEL: 7ba01b4

Unfortunately, RH has decided not to enable the VM hiding feature in KVM on RHEL and CentOS:
https://bugzilla.redhat.com/show_bug.cgi?id=1492173

ISSUE REFERENCE: #3546

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[markllama]

I signed it

[markllama]

/recheck

[markllama]

I signed it

[tstromberg]

@minikube-bot OK to test

[tstromberg]

Thanks for the patch!

I'm concerned that this patch may break GPU support, and unfortunately the GPU testing node is offline in our CI system. I'll need to check-in to see what the state of the testing config is to see if I can get this properly tested.

/cc @balopat

[tstromberg]

Related issue for GPU testing: #3590

[markllama]

I signed it

[gbraad]

I would suggest a way to disable this feature, instead of assuming this a default. As said, this only affects RHEL and is a choice, so disable based on feature or OS detection.

…

On Sun, Jan 27, 2019, 17:49 Mark Lamourine ***@***.*** wrote: I signed it — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#3586 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAAHZjskf79JSlmap9JVPZ8UfvOhOTO7ks5vHdiRgaJpZM4aS_TK> .

[markllama]

@gbraad I'd also suggest NOT making kvm hidden=true the default. At this point it won't be available in either RHEL or CentOS

[afbjorklund]

I think this already requires --gpu parameter for minikube (says #3459), so could version it on that ?

Making it an option seems like the best choice here, if half want it to be on and half want it to be off...

[afbjorklund]

Judging from the comment from the reason why it is not included, seems better as a separate --hidden.

The NVIDIA driver failing when detecting the KVM hypervisor is an indication that NVIDIA does not support this configuration and therefore neither does Red Hat.

[afbjorklund]

Should be off by default now.