provider/aws: optional fields in aws_autoscaling_lifecycle_hook

[pcarrier]

For #5614

[stack72]

thanks for the change here @pcarrier :) LGTM!

[stack72]

make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSAutoscalingLifecycleHook' 2>~/tf.log
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /vendor/)
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSAutoscalingLifecycleHook -timeout 120m
=== RUN   TestAccAWSAutoscalingLifecycleHook_basic
--- PASS: TestAccAWSAutoscalingLifecycleHook_basic (167.86s)
=== RUN   TestAccAWSAutoscalingLifecycleHook_omitDefaultResult
--- PASS: TestAccAWSAutoscalingLifecycleHook_omitDefaultResult (199.93s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    367.806s

[ghost]

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