[AWS] Retry AttachInternetGateway and increase timeout

[carlossg]

We've seen cases where it fails due to AWS eventual consistency

[jen20]

Hi @carlossg! I have personally seen this issue - however I think it would be best for either @catsby or @stack72 to review this since they have more context here.

[stack72]

This seems like a sane change :) The tests look good as well!

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSInternetGateway_'                                          ✹
==> Checking that code complies with gofmt requirements...
/Users/stacko/Code/go/bin/stringer
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/08/08 13:10:31 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSInternetGateway_ -timeout 120m
=== RUN   TestAccAWSInternetGateway_importBasic
--- PASS: TestAccAWSInternetGateway_importBasic (60.60s)
=== RUN   TestAccAWSInternetGateway_basic
--- PASS: TestAccAWSInternetGateway_basic (107.23s)
=== RUN   TestAccAWSInternetGateway_delete
--- PASS: TestAccAWSInternetGateway_delete (85.25s)
=== RUN   TestAccAWSInternetGateway_tags
--- PASS: TestAccAWSInternetGateway_tags (89.44s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    342.546s

[ghost]

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