provider/aws: Making the AutoScalingGroup name optional

[stack72]

Fixes #2632

make testacc TEST=./builtin/providers/aws TESTARGS='-run=AutoScalingGroup_autoGeneratedName' 2>~/tf.log
go generate ./...
TF_ACC=1 go test ./builtin/providers/aws -v -run=AutoScalingGroup_autoGeneratedName -timeout 90m
=== RUN   TestAccAWSAutoScalingGroup_autoGeneratedName
--- PASS: TestAccAWSAutoScalingGroup_autoGeneratedName (164.32s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    164.336s

[catsby]

LGTM, thanks!

[ghost]

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