An AWS Security Group Rule requires at least one of `cidr_blocks`, `self`, or `source_security_group_id` in order to be successfully created.
If the `aws_security_group_rule` doesn't contain one of these attributes, the AWS API will still return a `200` response, and not report any error in the response.
Example response from the API on a malformed submission:
```
2017/02/08 16:04:33 [DEBUG] plugin: terraform: -----------------------------------------------------
2017/02/08 16:04:33 [DEBUG] plugin: terraform: aws-provider (internal) 2017/02/08 16:04:33 [DEBUG] [aws-sdk-go] DEBUG: Response ec2/AuthorizeSecurityGroupIngress Details:
2017/02/08 16:04:33 [DEBUG] plugin: terraform: ---[ RESPONSE ]--------------------------------------
2017/02/08 16:04:33 [DEBUG] plugin: terraform: HTTP/1.1 200 OK
2017/02/08 16:04:33 [DEBUG] plugin: terraform: Connection: close
2017/02/08 16:04:33 [DEBUG] plugin: terraform: Transfer-Encoding: chunked
2017/02/08 16:04:33 [DEBUG] plugin: terraform: Content-Type: text/xml;charset=UTF-8
2017/02/08 16:04:33 [DEBUG] plugin: terraform: Date: Wed, 08 Feb 2017 21:04:33 GMT
2017/02/08 16:04:33 [DEBUG] plugin: terraform: Server: AmazonEC2
2017/02/08 16:04:33 [DEBUG] plugin: terraform: Vary: Accept-Encoding
2017/02/08 16:04:33 [DEBUG] plugin: terraform:
2017/02/08 16:04:33 [DEBUG] plugin: terraform: 102
2017/02/08 16:04:33 [DEBUG] plugin: terraform: <?xml version="1.0" encoding="UTF-8"?>
2017/02/08 16:04:33 [DEBUG] plugin: terraform: <AuthorizeSecurityGroupIngressResponse xmlns="http://ec2.amazonaws.com/doc/2016-11-15/">
2017/02/08 16:04:33 [DEBUG] plugin: terraform: <requestId>ac08c33f-8043-46d4-b637-4c4b2fc7a094</requestId>
2017/02/08 16:04:33 [DEBUG] plugin: terraform: <return>true</return>
2017/02/08 16:04:33 [DEBUG] plugin: terraform: </AuthorizeSecurityGroupIngressResponse>
2017/02/08 16:04:33 [DEBUG] plugin: terraform: 0
2017/02/08 16:04:33 [DEBUG] plugin: terraform:
2017/02/08 16:04:33 [DEBUG] plugin: terraform:
2017/02/08 16:04:33 [DEBUG] plugin: terraform: -----------------------------------------------------
```
This previously caused Terraform to wait until the security_group_rule propagated, which never happened due to the silent failure.
The changeset ensures that one of the required attributes are set prior to creating the aws_security_group_rule.
Also catches the error returned from the retry function. Previously the error was ignored, and only logged at the `DEBUG` level.
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