Remove RT kernel workaround and use new MC config instead

[slintes]

With openshift/machine-config-operator#1330 being merged, we can remove our workaround for installing the RT kernel and use the new config option of MachineConfig.

Not sure when this will be available in CI, so it might fail yet.

Edit: accidentally pushed a change on go vet, let's see what CI thinks about it. The original version did not work for me with Go 1.13.5

[MarSik]

/lgtm

I like it when we remove code :)

[slintes]

/hold

e2e test isn't required but should be green for this

[davidvossel]

/lgtm

looks good, this should be primed for merging once an ocp build picks up the change and our ci passes

[slintes]

cluster bootstrap failed

/retest

[slintes]

The RT kernel test passed! I only forgot to remove another test which checks existence of the removed rt kernel script.

[slintes]

/retest

[davidvossel]

/hold cancel

[davidvossel]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: davidvossel, MarSik, slintes

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [MarSik,davidvossel]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[slintes]

And we are green :)
@davidvossel do you mind putting a new lgmt on it? Thanks!

/hold cancel

[slintes]

And we are green :)
@davidvossel do you mind putting a new lgmt on it? Thanks!

/hold cancel

LOL, you were a bit faster than me :)