596: Update AWS SDK vendoring

[jparsons04]

Background

The vendored version of the AWS SDK is being updated to account for recent changes that have been made in the SDK. As it pertains to issue #596, ECS ContainerDefinitions have added new properties that we should support when l0 deploys are created, including the property LinuxParameters

How should this be tested?

• Create a Layer0 instance using this branch
• Create a Linux environment
• Create a Deploy using the following Dockerrun.aws.json

{
    "AWSEBDockerrunVersion": 2,
    "containerDefinitions": [
        {
            "name": "guestbook",
            "image": "quintilesims/guestbook",
            "portMappings": [
                {
                    "hostPort": 80,
                    "containerPort": 80
                }
            ],
            "memory": 512,
            "linuxParameters": {
                "capabilities": {
                    "add": ["SYS_PTRACE"]
                }
            }
        }
    ],
    "essential": true
}

• Create a service that using this Deploy in the Environment you created

• Confirm from the AWS console that the AWS Task Definition used to create the service contains the LinuxParameters block in ContainerDefinitions block of the JSON contents of the Task Definition. LinuxParameters should not be null.

• All unit tests must pass

closes #596

[jparsons04]

@sesh-kebab The specific approach I have taken to update the vendored version of the SDK was to execute the following: govendor fetch github.com/aws/aws-sdk-go/... to try to isolate dependencies to the project's directory tree.

[zpatrick]

Thanks @jparsons04 - will you DM me after you've built and pushed the binaries? I'd like to test with those before we announce this release