fix error string matching in test
fix error string matching in test

This package is no longer used, but we are retaining it for now for its
help in protocol test coverage.

ewbankkit/terraform,pdecat/terraform,pdecat/terraform,hashicorp/terraform,tommynsong/terraform,apparentlymart/terraform,rnaveiras/terraform,ewbankkit/terraform,hashicorp/terraform,rnaveiras/terraform,apparentlymart/terraform,ewbankkit/terraform,hashicorp/terraform,pdecat/terraform,tommynsong/terraform,rnaveiras/terraform,pdecat/terraform,apparentlymart/terraform,apparentlymart/terraform,ewbankkit/terraform,tommynsong/terraform,apparentlymart/terraform