providers/template: template_file supports floating point math

[mitchellh]

Fixes #7887

This adds a special case to detect numbers as floating point variables and converts them to floats. This allows floating point math to work.

[jbardin]

LGTM

[phinze]

This is unfortunately not a transparent change.

resource "template_file" "iam_policy" {
  template = "${file("${path.module}/templates/iam_policy.json.tpl")}"
  vars {
    region            = "${var.region}"
    owner_id          = "${aws_security_group.lab.owner_id}"
  }
}

This template is getting rendered as owner_id = "1.453785634567e+11"

[sethvargo]

This breaks when the value is a bigint. It overflows and you get sadness like 1.453785634567e+11, which is actually a bigint owner_id from AWS.

[ghost]

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