core: Fix TestContext2Plan_dataResourceBecomesComputed
core: Fix TestContext2Plan_dataResourceBecomesComputed

Data resources get processed during refresh, so it doesn't make sense to
have a data resource test that doesn't run the refresh walk.

luis-silva/terraform,apparentlymart/terraform,gechr/terraform,youhong316/terraform,pryorda/terraform,drebes/terraform,VladRassokhin/terraform,drebes/terraform,ewbankkit/terraform,rnaveiras/terraform,youhong316/terraform,luis-silva/terraform,ewbankkit/terraform,VladRassokhin/terraform,brandontosch/terraform,rnaveiras/terraform,brandontosch/terraform,tommynsong/terraform,drebes/terraform,apparentlymart/terraform,apparentlymart/terraform,VladRassokhin/terraform,ewbankkit/terraform,luis-silva/terraform,heimweh/terraform,youhong316/terraform,nlamirault/terraform,tpounds/terraform,apparentlymart/terraform,youhong316/terraform,VladRassokhin/terraform,hashicorp/terraform,iljaskevic/terraform,iljaskevic/terraform,tommynsong/terraform,pradeepbhadani/terraform,heimweh/terraform,mattray/terraform,ewbankkit/terraform,nlamirault/terraform,hashicorp/terraform,pdecat/terraform,iljaskevic/terraform,iljaskevic/terraform,pradeepbhadani/terraform,drebes/terraform,apparentlymart/terraform,nlamirault/terraform,tpounds/terraform,tpounds/terraform,tommynsong/terraform,pryorda/terraform,rnaveiras/terraform,brandontosch/terraform,pdecat/terraform,heimweh/terraform,brandontosch/terraform,hashicorp/terraform,heimweh/terraform,heimweh/terraform,pradeepbhadani/terraform,luis-silva/terraform,pryorda/terraform,tpounds/terraform,mattray/terraform,brandontosch/terraform,mattray/terraform,gechr/terraform,pdecat/terraform,mattray/terraform,pdecat/terraform,gechr/terraform