Support setting 'location' in google_sql_database_instance backup_configuration

[JamesGuthrie]

I would appreciate any feedback on this change. I am a newcomer to go, and to the terraform-provider-google project. I have added the feature to the best of my knowledge, and tested the creation of a new DB, as well as modifying the backup location after creation. I may have broken the tests, but it wasn't clear what I would have to do to get them to run locally.

Closes #4653

`sql`: added `location` field to `backup_configuration` block in `google_sql_database_instance`

[danawillow]

Hi @JamesGuthrie! The code for this looks good. Would you mind modifying one or more tests to use this new feature? The ones you want are in this file: https://github.com/terraform-providers/terraform-provider-google/blob/master/google/resource_sql_database_instance_test.go. I don't think it's a large enough change to merit its own test, so feel free to use existing ones. I'd recommend leaving at least one test around without the field set in order to check the behavior of what happens when the backup_configuration block is set without a location.

To run the tests, follow the instructions at https://github.com/terraform-providers/terraform-provider-google/blob/master/.github/CONTRIBUTING.md#tests. If it's still unclear, let me know and I'd be happy to run them for you (but hopefully we can improve our documentation in that case!)

[JamesGuthrie]

Hi Dana,

thanks for the feedback, I've added the block to one of the existing tests and ran it:

$> make testacc TESTARGS='-run=TestAccSqlDatabaseInstance_highAvailability'
==> Checking source code against gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 TF_SCHEMA_PANIC_ON_ERROR=1 go test $(go list ./... |grep -v 'vendor') -v -run=TestAccSqlDatabaseInstance_highAvailability -timeout 240m -ldflags="-X=github.com/terraform-providers/terraform-provider-google/version.ProviderVersion=acc"
?   	github.com/terraform-providers/terraform-provider-google	[no test files]
=== RUN   TestAccSqlDatabaseInstance_highAvailability
=== PAUSE TestAccSqlDatabaseInstance_highAvailability
=== CONT  TestAccSqlDatabaseInstance_highAvailability
--- PASS: TestAccSqlDatabaseInstance_highAvailability (601.98s)
PASS
ok  	github.com/terraform-providers/terraform-provider-google/google	602.029s
?   	github.com/terraform-providers/terraform-provider-google/scripts/affectedtests	[no test files]
?   	github.com/terraform-providers/terraform-provider-google/version	[no test files]

If you need me to make any other changes, or if I missed something, please let me know.

[danawillow]

Looks great, thanks!

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