[WIP] Metrics E2E work in PROW

[nachocano]

Fixes #317

[knative-prow-robot]

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[chizhg]

/test pull-google-knative-gcp-integration-tests

[chizhg]

/retest

[knative-prow-robot]

@nachocano: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-google-knative-gcp-integration-tests	6037173	link	/test pull-google-knative-gcp-integration-tests

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[nachocano]

/close should revisit this later on