[release-3.11] admission: split plugins into validating-only and mutating+validating

[openshift-cherrypick-robot]

This is an automated cherry-pick of #20743

/assign sttts

[sttts]

/retest

[sttts]

/retest

[sttts]

@stevekuznetsov the extended_builds job is red, I can neither see logs nor restart it. Any idea?

[simo5]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: openshift-cherrypick-robot, simo5
To fully approve this pull request, please assign additional approvers.
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[sttts]

/retest

[sttts]

@deads2k approved?

[sttts]

/assign @smarterclayton

Is this approved for 3.11?

[stevekuznetsov]

/retest

[stevekuznetsov]

{
  "component": "jenkins-operator",
  "error": "response not 201: 404 Not Found",
  "event-GUID": "19663d50-b82d-11e8-9e25-ea9e89a2b4d2",
  "job": "test_pull_request_origin_extended_builds-release-3.11",
  "level": "warning",
  "msg": "Cannot start Jenkins build",
  "name": "19f4f81a-b82d-11e8-bc65-0a58ac100b2a",
  "org": "openshift",
  "pr": 20945,
  "repo": "origin",
  "time": "2018-09-14T14:47:45Z",
  "type": "presubmit"
}

@smarterclayton did you branch that job?

[derekwaynecarr]

@sttts i sent a mail discussing this PR (and the other) to decide on outcome.

[derekwaynecarr]

this will wait until 4.0.