terraform: output nodes can have depends_on

[mitchellh]

This adds depends_on to output.

The primary use case for this is to depend on resources that may have a side effect that the output is depending on. For example: a resource may be a local-exec provisioner to create a file that the output is reading with ${file()}.

Another reason to add this is to support module-level depends_on which would impose a depends_on on all contained items (resources, modules, etc.).

This doesn't put a "Dependencies" list into the state for outputs because dependency ordering only matters for creation and updates, not for orphan destruction.

[ghost]

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