Fix typo in environment variable
Fix typo in environment variable

The correct environment variable corresponding to the `ca_file` variable is `CONSUL_CACERT` and not `CONSUL_CAFILE`.

See `backend/remote-state/consul/backend.go` line 77.
brandontosch/terraform,nlamirault/terraform,ewbankkit/terraform,gechr/terraform,ewbankkit/terraform,brandontosch/terraform,VladRassokhin/terraform,VladRassokhin/terraform,VladRassokhin/terraform,brandontosch/terraform,apparentlymart/terraform,pdecat/terraform,heimweh/terraform,gechr/terraform,ewbankkit/terraform,ewbankkit/terraform,pdecat/terraform,nlamirault/terraform,apparentlymart/terraform,apparentlymart/terraform,nlamirault/terraform,pryorda/terraform,pryorda/terraform,rnaveiras/terraform,pradeepbhadani/terraform,gechr/terraform,apparentlymart/terraform,tommynsong/terraform,brandontosch/terraform,heimweh/terraform,rnaveiras/terraform,heimweh/terraform,tommynsong/terraform,brandontosch/terraform,pryorda/terraform,tommynsong/terraform,pradeepbhadani/terraform,apparentlymart/terraform,rnaveiras/terraform,VladRassokhin/terraform,hashicorp/terraform,pdecat/terraform,heimweh/terraform,hashicorp/terraform,heimweh/terraform,pdecat/terraform,hashicorp/terraform,pradeepbhadani/terraform