alpha1: destroy shows data sources destroying

[mitchellh]

Terraform Version

terraform → ~/bin/terraform version
Terraform v0.12.0-dev (009534d1016cd3b1d0d911f151520b04f8db453a)
+ provider.google v1.19.1-3-g59efc8b9
+ provider.null v1.0.0-4-g0b90acb
+ provider.random v2.0.0-4-gb282401

Terraform Configuration Files

Same config as: #19152

Note: requires latest Terraform master and Google provider recompiled to avoid the above issue.

Expected Behavior

The destroy command plan shows only real resources to destroy.

While it makes sense from an internal/state perspective that the data sources are being "destroyed", it is odd as an end user since they're just sources of data. At worst, it can be very scary because it seems to imply that the actual data source will be destroyed (even though only the cached data is of course).

Terraform <= 0.11.x didn't show this.

Actual Behavior

The destroy command plan shows data sources being destroyed.

Steps to Reproduce

Apply then destroy.

[ghost]

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