TestWebSocket* and TestGRPC* does not pass with parallel

[nak3]

In what area(s)?

/area networking
/area test-and-release

As commented https://github.com/knative/serving/pull/11322/files#r636574573, e2e test with --https option does not work with t.Parallel() for TestWebSocket*.

Example log
https://prow.knative.dev/view/gs/knative-prow/pr-logs/pull/knative_serving/11322/pull-knative-serving-https/1395322718584311808
https://prow.knative.dev/view/gs/knative-prow/pr-logs/pull/knative_serving/11322/pull-knative-serving-https/1395530844940013568

It often fails as it cannot establish the connection as:

websocket.go:83: Connection failed: dial tcp 35.231.11.204:443: connect: connection refused
websocket_test.go:143: timed out waiting for the condition

FWIW, the error does not happen on local env (tested on AWS) by running go test -v -race -tags=e2e -count=1 ./test/e2e/ -run "TestGRPC|TestWebSocket" command.

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[dprotaso]

/triage accepted