Remove unused and undocumented binary schema type #3328
Description
What version of Dgraph are you using?
latest, master
Have you tried reproducing the issue with latest release?
Yes
Steps to reproduce the issue (command/config used to run Dgraph).
Alter the schema to set a predicate to a binary type.
Expected behaviour and actual result.
Dgraph no longer needs a binary type exposed as an available predicate type. They were originally sent as bytes from the client and are returned as base64-encoded strings in JSON responses. Everything that's possible with binary types including custom tokenizers is already available for strings.