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Now that we have policytest and the policyclient.Client interface, we can de-global-ify many of the tests, letting them run concurrently with each other, and just removing global variable complexity. This does ~half of the LocalBackend ones. Updates #16998 Change-Id: Iece754e1ef4e49744ccd967fa83629d0dca6f66a Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>