Skip flaky tests

[vagababov]

/assign mattmoor @evankanderson

#1672

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[mattmoor]

/lgtm

This flakes like crazy, and is desensitizing folks to unit test failures. Let's disable the test and investigate.

I think @yanweiguo is community oncall this week per https://github.com/knative/serving/blob/master/support/COMMUNITY_CONTACTS.md

[knative-metrics-robot]

The following is the coverage report on the affected files.
Say /test pull-knative-pkg-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
metrics/resource_view.go	91.5%	86.6%	-4.9

[yanweiguo]

I think @yanweiguo is community oncall this week per https://github.com/knative/serving/blob/master/support/COMMUNITY_CONTACTS.md

Didn't notice that. Will pick up #1672