Remove namespace from clusterrole and clusterrolebinding

[aaronjwood]

Cluster roles and cluster role bindings are cluster-wide and not namespace specific. We had a case where this broke installation for us due to some client-go code throwing back a not found error (https://github.com/kubernetes/apimachinery/blob/master/pkg/api/errors/errors.go#L122) when trying to create these two resources in the cluster. Taking out the namespace (which is set to kube-system after the template is instantiated) for the cluster-wide resources got everything to work correctly.

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[istio-testing]

Hi @aaronjwood. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[venilnoronha]

/ok-to-test