bugfix: cf-tf adds extra space before IDs in ruleset rules block

[tamas-jozsa]

I was checking a customer's tf config why it was failing and noticed this:

...
action = "skip"
  action_parameters {
    rules = {
      "4814384a9e5d4991b9815dcfc25d2f1f" = "37da7855d2f94f69865365d894a556a4, 6afe6795ee6a48d6a1dfe59255395a78, 5a6f5a57cde8428ab0668ce17cdec0c8, 5e4903d6afa841c9b88b96203297003f, 2380cd409b604c2a9273042f3eb29c4e, f5aebedc99a14c8d9e8cfa2ce5f94216, edf8c37cc81747d382690b3c77e82ce4, 1129dfb383bb42e48466488cf3b37cb1"
    }
  }
...

It's not much, but if you try to apply it, you can see the JSON that is sent to rulesets:

...
"action": "skip",
"action_parameters": {
    "rules": {
        "4814384a9e5d4991b9815dcfc25d2f1f": [
            "37da7855d2f94f69865365d894a556a4",
            " 6afe6795ee6a48d6a1dfe59255395a78",
            " 5a6f5a57cde8428ab0668ce17cdec0c8",
            " 5e4903d6afa841c9b88b96203297003f",
            " 2380cd409b604c2a9273042f3eb29c4e",
            " f5aebedc99a14c8d9e8cfa2ce5f94216",
            " edf8c37cc81747d382690b3c77e82ce4",
            " 1129dfb383bb42e48466488cf3b37cb1"
        ]
    }
},
...

It could be that the old way of generating the TF trimmed the whitespace for us and in the new way, it doesn't do that anymore.

Anyway, this PR is to fix this bug.