Tests that rely on google_compute_address are failing

[danawillow]

#378 changed region to be set on read from the API. The API returns region as a URL, so if a user specified it as a short name, it gets overridden. The solution might be as simple as only storing the last part of the region URL, but I haven't really investigated it yet.

Example test failure:

=== RUN   TestAccComputeRouterInterface_basic
--- FAIL: TestAccComputeRouterInterface_basic (213.52s)
    testing.go:434: Step 0 error: After applying this step, the plan was not empty:
        
        DIFF:
        
        DESTROY/CREATE: google_compute_address.foobar
          address:   "35.202.203.23" => "<computed>"
          name:      "router-interface-test-mbf86si3bk" => "router-interface-test-mbf86si3bk"
          region:    "https://www.googleapis.com/compute/v1/projects/*******/regions/us-central1" => "us-central1" (forces new resource)
          self_link: "https://www.googleapis.com/compute/v1/projects/*******/regions/us-central1/addresses/router-interface-test-mbf86si3bk" => "<computed>"
[other stuff]

@rosbo

[ghost]

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