r/vpc: Ignore ClassicLink DNS support in unsupported regions

[radeksimko]

This is to address the following tests

=== RUN   TestAccAWSDefaultNetworkAcl_basicIpv6Vpc
--- FAIL: TestAccAWSDefaultNetworkAcl_basicIpv6Vpc (8.61s)
    testing.go:428: Step 0 error: Error applying: 1 error(s) occurred:
        
        * aws_vpc.tftestvpc: 1 error(s) occurred:
        
        * aws_vpc.tftestvpc: AuthFailure: This request has been administratively disabled.
            status code: 403, request id: 34e0bacc-181c-4cb9-8b3f-bf43b7871e1d
    testing.go:492: Error destroying resource! WARNING: Dangling resources
        may exist. The full state and error is shown below.
=== RUN   TestAccAWSNetworkAcl_ipv6VpcRules
--- FAIL: TestAccAWSNetworkAcl_ipv6VpcRules (8.84s)
    testing.go:428: Step 0 error: Error applying: 1 error(s) occurred:
        
        * aws_vpc.foo: 1 error(s) occurred:
        
        * aws_vpc.foo: AuthFailure: This request has been administratively disabled.
            status code: 403, request id: aec9548e-ce1b-49c9-a5d5-1354230c73e1
    testing.go:492: Error destroying resource! WARNING: Dangling resources
        may exist. The full state and error is shown below.
=== RUN   TestAccDataSourceAwsRouteTable_main
--- FAIL: TestAccDataSourceAwsRouteTable_main (9.49s)
    testing.go:428: Step 0 error: Error applying: 1 error(s) occurred:
        
        * aws_vpc.test: 1 error(s) occurred:
        
        * aws_vpc.test: AuthFailure: This request has been administratively disabled.
            status code: 403, request id: 18a7bb2c-581a-4867-9373-dd397310e93e
    testing.go:492: Error destroying resource! WARNING: Dangling resources
        may exist. The full state and error is shown below.

which started to fail after merging #1079

I did verify that this error only appears in unsupported region (us-east-2 in our case) and disappears in supported region (us-west-2).

[Ninir]

LGTM!

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSDefaultNetworkAcl_basicIpv6Vpc'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -run=TestAccAWSDefaultNetworkAcl_basicIpv6Vpc -timeout 120m
=== RUN   TestAccAWSDefaultNetworkAcl_basicIpv6Vpc
--- PASS: TestAccAWSDefaultNetworkAcl_basicIpv6Vpc (68.18s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	68.219s

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSNetworkAcl_ipv6VpcRules'       
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -run=TestAccAWSNetworkAcl_ipv6VpcRules -timeout 120m
=== RUN   TestAccAWSNetworkAcl_ipv6VpcRules
--- PASS: TestAccAWSNetworkAcl_ipv6VpcRules (61.51s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	61.541s

$ make testacc TEST=./aws TESTARGS='-run=TestAccDataSourceAwsRouteTable_main'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -run=TestAccDataSourceAwsRouteTable_main -timeout 120m
=== RUN   TestAccDataSourceAwsRouteTable_main
--- PASS: TestAccDataSourceAwsRouteTable_main (60.49s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	60.531s

[ghost]

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