aws_autoscaling_group doesn't permit load_balancers.*

[ianatha]

When the load_balancers arguments is used in an aws_autoscaling_group instance, one gets:

There are warnings and/or errors related to your configuration. Please
fix these before continuing.

Errors:

  * 'aws_autoscaling_group.ingress_nodes' error: Unknown configuration: load_balancers.#
  * 'aws_autoscaling_group.ingress_nodes' error: Unknown configuration: load_balancers.0

load_balancers is properly calculated in the diffing code for aws_autoscaling_group:

$ grep -R load_balancers builtin/providers/aws
builtin/providers/aws/resource_aws_autoscaling_group.go:    if _, ok := rs.Attributes["load_balancers.#"]; ok {
builtin/providers/aws/resource_aws_autoscaling_group.go:            rs.Attributes, "load_balancers").([]interface{}))
builtin/providers/aws/resource_aws_autoscaling_group.go:            "load_balancers":            diff.AttrTypeCreate,
builtin/providers/aws/resource_aws_autoscaling_group.go:        toFlatten["load_balancers"] = flattenLoadBalancers(g.LoadBalancerNames)
builtin/providers/aws/resource_aws_autoscaling_group.go:            "load_balancers.*",