HCL formatter adds additional space between interpolations sequences

[apparentlymart]

In the 0.12.0 prereleases and in current master, given a string like this:

  "${foo}${bar}"

...the terraform fmt command wants to insert a space between the two sequences, changing the meaning:

  "${foo} ${bar}"

This is actually hashicorp/hcl2#65, but we're tracking it over here so we can see it as part of the v0.12.0 milestone.

[ghost]

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