Terminate Stack Retry Feature Request

[bryantidd]

Because of a known error in Elastic Beanstalk, blue/green terminate inactive can fail. The problem lies in a timing problem between ec2 resources and eb termination. Sometimes (often for those of use who do continuous deployment) the stack will fail to terminate because it thinks there is still a dependent resource on a security group. In all cases, I have found that requesting that the environment be terminated again after the error results in a successful termination. Since we use eb_deployer so heavily in our continuous delivery scheme, it would be of great value to have a retry termination feature available when the stack fails to terminate initially. It would be valuable to have a number of retry attempts.