Updating the way Forseti Server Configuration is retrieved from GCS

[hiloboy0119]

Moved away from google_storage_object_signed_url as it requires
a local json keyfile and I am deploying using service account
impersonation.

hashicorp/terraform-provider-google#3558

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[hiloboy0119]

@googlebot I signed it!

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[gkowalski-google]

Thanks for the contribution! I assume this change is partly dependent on the Helm PR?

[gkowalski-google]

@hiloboy0119 The lint tests failed for 2 reasons:

1. Please run make docker_generate_docs to update the docs for the helm_chart_version change
2. This line failed because it's expected that all expressions have the equal signs line up. See my comment on that particular line, which I believe can be removed anyway.

[gkowalski-google]

@hiloboy0119 Following up on this PR, please look into my comments above.

[gkowalski-google]

@hiloboy0119 Another ping on this PR, do you still wish to move forward with this change?

[gkowalski-google]

@hiloboy0119 Checking in to see if you still want to move forward with this PR.

[gkowalski-google]

Thanks @hiloboy0119 for this PR. We are now hitting the same issue on this PR where I am adding tests for the GKE example. I'm going to merge this change into my branch, so that we can fix the tests and include them in the upcoming release.