provider/aws: Add Placement Constraints to ECS Task Definition

[catsby]

Adds support for applying placement constraints to aws_ecs_task_definition resource. Refs #10968

• Amazon EC2 Container Service: Task Placement Constraints

TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSEcsTaskDefinition_ -timeout 120m
=== RUN   TestAccAWSEcsTaskDefinition_basic
--- PASS: TestAccAWSEcsTaskDefinition_basic (20.61s)
=== RUN   TestAccAWSEcsTaskDefinition_withScratchVolume
--- PASS: TestAccAWSEcsTaskDefinition_withScratchVolume (12.22s)
=== RUN   TestAccAWSEcsTaskDefinition_withEcsService
--- PASS: TestAccAWSEcsTaskDefinition_withEcsService (143.42s)
=== RUN   TestAccAWSEcsTaskDefinition_withTaskRoleArn
--- PASS: TestAccAWSEcsTaskDefinition_withTaskRoleArn (13.27s)
=== RUN   TestAccAWSEcsTaskDefinition_withNetworkMode
--- PASS: TestAccAWSEcsTaskDefinition_withNetworkMode (13.38s)
=== RUN   TestAccAWSEcsTaskDefinition_constraint
--- PASS: TestAccAWSEcsTaskDefinition_constraint (12.10s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    215.027s

[stack72]

This LGTM! :)

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSEcsTaskDefinition_'                                  1 ↵ ✭
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/01/04 15:38:20 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSEcsTaskDefinition_ -timeout 120m
=== RUN   TestAccAWSEcsTaskDefinition_basic
--- PASS: TestAccAWSEcsTaskDefinition_basic (145.46s)
=== RUN   TestAccAWSEcsTaskDefinition_withScratchVolume
--- PASS: TestAccAWSEcsTaskDefinition_withScratchVolume (20.59s)
=== RUN   TestAccAWSEcsTaskDefinition_withEcsService
--- PASS: TestAccAWSEcsTaskDefinition_withEcsService (159.28s)
=== RUN   TestAccAWSEcsTaskDefinition_withTaskRoleArn
--- PASS: TestAccAWSEcsTaskDefinition_withTaskRoleArn (32.89s)
=== RUN   TestAccAWSEcsTaskDefinition_withNetworkMode
--- PASS: TestAccAWSEcsTaskDefinition_withNetworkMode (23.20s)
=== RUN   TestAccAWSEcsTaskDefinition_constraint
--- PASS: TestAccAWSEcsTaskDefinition_constraint (25.27s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/aws	406.715s

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