[release-3.7] Include proto swagger in discovery

[openshift-cherrypick-robot]

This is an automated cherry-pick of #18105

/assign juanvallejo

[liggitt]

/lgtm

[liggitt]

needs OSE pick

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: liggitt, openshift-cherrypick-robot

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[liggitt]

/hold
actually, I'm not certain this path existed in 3.7... can you check?

[juanvallejo]

@liggitt checked against free-stg:

$ oc version
oc v3.7.0+7ed6862-dirty
kubernetes v1.7.6+a08f5eeb62
features: Basic-Auth

Server https://api.free-stg.openshift.com:443
openshift v3.7.23
kubernetes v1.7.6+a08f5eeb62

$ oc get --raw /
{
  "paths": [
    "/api",
    "/api/v1",
...
    "/metrics",
    "/oapi",
    "/oapi/v1",
    "/swagger-2.0.0.json",
    "/swagger-2.0.0.pb-v1",
    "/swagger-2.0.0.pb-v1.gz",
    "/swagger.json",
    "/swaggerapi",
    "/version",
    "/version/openshift"
  ]
}%

[liggitt]

ok, good, must have just moved in the code in 1.8
/hold cancel

[juanvallejo]

/test gcp

[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.

[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.

[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.

[openshift-merge-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[openshift-merge-robot]

Automatic merge from submit-queue.