test/aws_mq_broker: Add dependency on IGW

[radeksimko]

This is to address the following test failure:

=== RUN   TestAccAwsMqBroker_allFieldsCustomVpc
--- FAIL: TestAccAwsMqBroker_allFieldsCustomVpc (177.28s)
    testing.go:513: Step 0 error: Error applying: 1 error(s) occurred:
        
        * aws_mq_broker.test: 1 error(s) occurred:
        
        * aws_mq_broker.test: BadRequestException: The VPC associated with the provided subnets must have an available internet gateway attachment.
            status code: 400, request id: e53c0111-0018-11e8-ad33-07f096e8eb22

Test results

=== RUN   TestAccAwsMqBroker_allFieldsCustomVpc
--- PASS: TestAccAwsMqBroker_allFieldsCustomVpc (2339.20s)

[bflad]

Works for me. I assume we just need the IGW to exist in the VPC and not associated with the subnets or anything via the route table association.

make testacc TEST=./aws TESTARGS='-run=TestAccAwsMqBroker_allFieldsCustomVpc'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -run=TestAccAwsMqBroker_allFieldsCustomVpc -timeout 120m
=== RUN   TestAccAwsMqBroker_allFieldsCustomVpc
--- PASS: TestAccAwsMqBroker_allFieldsCustomVpc (1894.69s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	1894.747s

[ghost]

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