gce: normalize scopes in comparison

[justinsb]

The order of scopes should not matter here, so do not force
a new instance template just because the order is different.

[k8s-ci-robot]

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[k8s-ci-robot]

@justinsb: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-test	7e3f876	link	true	/test pull-kops-test

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