[WIP] Fix TestGlobalResyncOnUpdateDomainConfigMap getting stuck (#2307)
[WIP] Fix TestGlobalResyncOnUpdateDomainConfigMap getting stuck (#2307)

Sometimes TestGlobalResyncOnUpdateDomainConfigMap gets stuck while
waiting on a routeModified event which doesn't get delivered via
routeWatcher for a currently unknown reason.

Example:
https://gubernator.knative.dev/build/knative-prow/pr-logs/pull/knative_serving/2000/pull-knative-serving-unit-tests/1055195078827446273/

This should unstuck the test.
knative/serving,knative/serving