Make route priority optional, default to 1000

[jphalip]

Fixes #1009

[emilymye]

Looks good to me! Could you also change the docs to show that priority is default? Thank you!

[jphalip]

@emilymye Sure, just updated the doc. Thanks!

[emilymye]

Awesome, thanks!

make testacc TEST=./google TESTARGS='-run=TestAccComputeRoute_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./google -v -run=TestAccComputeRoute_basic -timeout 120m
=== RUN TestAccComputeRoute_basic
--- PASS: TestAccComputeRoute_basic (62.68s)
PASS
ok github.com/terraform-providers/terraform-provider-google/google62.864s

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