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.
Following the examples as they were previously would cause errors
accessing demo.consul.io. Now we consistently set the scheme to https for
all examples that use demo.consul.io.
This also includes some other updates to the URLs, since the Consul demo
has been rebuilt with a different based configuration, and some general
formatting and copyediting changes in the Consul example.
Benoit D