Move centos7-crio CI job to centos8

[floryut]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Move centos7 crio CI job to centos8

Which issue(s) this PR fixes:
None

Special notes for your reviewer:
CRI-O are considering removing centos7 "support", CI is broken twice a week with centos7-crio, stop this madness.

Does this PR introduce a user-facing change?:

Maybe warn users about centos7 and crio..

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut

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[floryut]

@champtar Ready 🎉
/cc @EppO
/cc @oomichi

[oomichi]

@floryut Thanks for doing this. I also faced the test failure related to centos7-crio.
As we see the test success here, it is nice to move it to centos8 to make tests stable.

/lgtm

BTW is the centos8 a CentOS Linux or Stream?

[floryut]

@floryut Thanks for doing this. I also faced the test failure related to centos7-crio.
As we see the test success here, it is nice to move it to centos8 to make tests stable.

/lgtm

BTW is the centos8 a CentOS Linux or Stream?

As of now still CentOS Linux

[champtar]

With the recent announcements, I wonder if it's doable to use RHEL in the CI