* remove leftover debug line
* terraform: refactor ProviderEvalTree
This PR refactors the ProviderEvalTree by folding the entire tree into
straight-through code in NodeApplyableProvider Execute (formally
EvalTree). The EvalConfigProvider functions were refactored into
NodeApplyableProvider functions (since that was the only place they were
used).
I also removed the unused node_provider_disabled code.
* revert removal of graphNodeCloseProvider EvalTree, replace with Execute
