[WIP] Make metrics E2E test work in PROW

[nachocano]

Fixes #317

[knative-prow-robot]

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[nachocano]

let's see if this fixes it

[nachocano]

trying one more time with @chizhg suggestion in #317

[chizhg]

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

[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	6049627	link	/test pull-google-knative-gcp-integration-tests

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[nachocano]

@chaodaiG @chizhg I made the change but still no luck.. is weird... If you guys have access to the UI, we can check the metrics explorer under monitoring to see if they are actually sent.
I can add a big sleep so that we can login in the cluster, and see the logs from the pods as well...
will ping you back next week, thanks!

[nachocano]

will continue on another one