Support provider alias as data type with tf 0.12

[albuch]

Installation details

• [x] IDE version: IntelliJ IDEA 2019.1.3 (Ultimate Edition) Build #IU-191.7479.19, built on May 28, 2019
• [x] intellij-hcl plugin version: v0.7.0
• [x] Terraform version: 0.12.0

Terraform Configuration Files

provider "aws" {
  alias   = "iam"
  region  = var.region
  version = "~> 2.12.0"
}

resource "aws_iam_user" "test" {
  name          = "test"
  path          = "/"

  provider = aws.iam
}

module "test" {
  source = "./modules/test"
  providers = {
    aws.target = aws.iam
  }
}

Exception

For resource:
Unresolved reference iam

For module:
<property> expected, got '.'
Unresolved reference iam
<identifier> or <string literal> expected, got '}'

Expected Behavior

Plugin should not report a validation error for provider alias data type when not defined as a string literal. For Modules provider target alias should not be reported as an error if not defined as a string literal.

Actual Behavior

Provider alias is reported as error, see exception section.

[VladRassokhin]

Fixed in 0.7.1, will be released shortly