Move functions using global test flags to *_test file

[AwesomePatrol]

Newly added helper functions were part of the package while the variables they depend on were defined in the *_test.go resulting in compile failures.

Alternative solutions:

1. Move test-helpers to helpers_test - all functions/variables in this file are unexported so it is useless as a package anyway
2. Add new arguments to newly added functions so they won't depend on global variables - helpers would be not that helpful and it would be better to inline them (as each is called only once)

/cc @kl52752 /assign @bowei

[kl52752]

thanks for fixing the build. /lgtm

[bowei]

How did we manage to commit a build break? Can we (separate PR) fix the build so this is not possible to submit?

[bowei]

/lgtm /approve

[google-oss-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AwesomePatrol, bowei

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[kl52752]

How did we manage to commit a build break? Can we (separate PR) fix the build so this is not possible to submit?

Prow is doing make test which is not building the repo. I'm fixing that.

[kl52752]

@bowei Fix PR PTAL