Parallel to https://github.com/terraform-providers/terraform-provider-azurerm/pull/2116
We need to run `gofmt -s` to switch over to the `gofmt` rule, and MM is going to complicate that. Once `1.20.0` is done, I'll run that command on flat MM files & add a `gofmt -s` step to MM generation (goimports does gofmt but doesn't do the s flag for silly reasons).
I'll duplicate this over to tpgb once this PR is merged.
Many of the d.Set calls do not handle the error that comes back. This can lead
to things that appear to be set but are silently failing. This change adds a
flag to the makefile to force a panic if there are unhandled errors.
