Remove quoted types

[jwavoet]

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[pvlierop]

This look good to me.

This was necessary for 0.11 and earlier.

Now the quotes can be removed.

[JoostSaanen]

Type is not really needed here, because string is the default

[pvlierop]

Removal is also fine by me.
The issue is that this fix needs to be merged and released so it can be used with current versions of terraform.