Terraform-provider-aws: providers/aws aws_instance not importing network interfaces

Terraform Version

Terraform v0.10.2

Affected Resource(s)

• aws_instance

Expected Behavior

tfstate should bring all the network interfaces attached to the instance like ebs block devices.

Actual Behavior

It always import 0 interfaces

Steps to Reproduce

1. import AWS instance with 2 or more network interfaces attached to it terraform import aws_instance.test instance-id
2. check terraform.tfstate, you will see network_interface.#: "0"
3. if you try to add them manually to configuration file and execute terraform plan you will get -/+ aws_instance.test (new resource required) ... Plan: 1 to add, 0 to change, 1 to destroy.