Updating EIP Instance to Computed

[stack72]

As per #2943

When we attach an instance to an EIP, terraform currently tries to destroy it:

My code works as follows:

resource "aws_eip" "nat_ip" {
  vpc = true
  network_interface = "${aws_network_interface.nat_eni.id}"
}

resource "aws_network_interface" "nat_eni" {
  subnet_id = "${aws_subnet.primary-public.id}"
  security_groups = ["${aws_security_group.nat.id}"]
  source_dest_check = false

  tags {
    Name = "NAT ENI"
  }
}

When an instance comes up, it attaches itself to the ENI (thanks to the PR above, that stays). But it looks like the EIP is removing itself on the second run:

~ aws_eip.nat_ip
    instance: "i-3f8f8092" => ""

[stack72]

Closed this for now until I can get the tests working. Opened an issue as #2952 incase anyone fixes it in the mean-time

[ghost]

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