provider/aws: Show last scaling activity when ASG creation/update fails

[radeksimko]

Closes #9074

Config to reproduce the error: https://gist.github.com/radeksimko/c2418796a87d8458d85abb2767c5e9a6

Before

Error applying plan:

1 error(s) occurred:

* aws_autoscaling_group.bar: 1 error(s) occurred:

* aws_autoscaling_group.bar: "radeksimko-terraform-test": Waiting up to 20s: Need at least 4 healthy instances in ASG, have 0

After

Error applying plan:

1 error(s) occurred:

* aws_autoscaling_group.bar: 1 error(s) occurred:

* aws_autoscaling_group.bar: "radeksimko-terraform-test": Waiting up to 20s: Need at least 4 healthy instances in ASG, have 0 Most recent activity: {
  ActivityId: "f9b6fb3b-4996-4f2e-86fa-cea062ae7730",
  AutoScalingGroupName: "radeksimko-terraform-test",
  Cause: "At 2017-05-15T06:35:52Z a user request created an AutoScalingGroup changing the desired capacity from 0 to 4.  At 2017-05-15T06:35:55Z an instance was started in response to a difference between desired and actual capacity, increasing the capacity from 0 to 4.",
  Description: "Launching a new EC2 instance.  Status Reason: Value (wrongval) for parameter virtualName is invalid. Expected format: 'ephemeral<NUMBER>'. Launching EC2 instance failed.",
  Details: "{\"Availability Zone\":\"us-east-2a\"}",
  EndTime: 2017-05-15 06:35:56 +0000 UTC,
  Progress: 100,
  StartTime: 2017-05-15 06:35:56.153 +0000 UTC,
  StatusCode: "Failed",
  StatusMessage: "Value (wrongval) for parameter virtualName is invalid. Expected format: 'ephemeral<NUMBER>'. Launching EC2 instance failed."
}

[stack72]

Very nice!

[ghost]

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