tests/resource_aws_autoscaling_group: Update test configuration… (#9488)
tests/resource_aws_autoscaling_group: Update test configuration… (#9488)

Acceptance before change
```
--- FAIL: TestAccAWSAutoScalingGroup_MixedInstancesPolicy_LaunchTemplate_LaunchTemplateSpecification_Version (50.58s)
    testing.go:568: Step 2 error: errors during apply:

        Error: Error updating Autoscaling group: ValidationError: Invalid launch template version: either '$Default', '$Latest', or a numeric version are allowed.
        	status code: 400, request id: 5b512fce-ae29-11e9-9ea6-81e62f42c278

          on /opt/teamcity-agent/temp/buildTmp/tf-test310684001/main.tf line 20:
          (source code not available)

```

Acceptance testing after change
```
--- PASS: TestAccAWSAutoScalingGroup_launchTemplate_update (109.94s)
--- PASS: TestAccAWSAutoScalingGroup_MixedInstancesPolicy_LaunchTemplate_LaunchTemplateSpecification_Version (49.40s)
```
terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws