wireprotov2: remove support for sending bytes response

We recently declared that all responses must be CBOR. So remove
support for sending a type that isn't CBOR data.

Differential Revision: https://phab.mercurial-scm.org/D3387

mercurial/wireprotov2server.py

@@ -301,11 +301,7 b' def _httpv2runcommand(ui, repo, req, res'
     res.status = b'200 OK'
     res.headers[b'Content-Type'] = FRAMINGTYPE
 
-    if isinstance(rsp, wireprototypes.bytesresponse):
-        action, meta = reactor.oncommandresponseready(outstream,
-                                                     command['requestid'],
-                                                     rsp.data)
-    elif isinstance(rsp, wireprototypes.cborresponse):
+    if isinstance(rsp, wireprototypes.cborresponse):
         encoded = cbor.dumps(rsp.value, canonical=True)
         action, meta = reactor.oncommandresponseready(outstream,
                                                       command['requestid'],