Change some names

Author: atburke

api/client/joinservice.go

@@ -231,21 +231,21 @@ func (c *JoinServiceClient) RegisterUsingOracleMethod(
 		return nil, trace.Wrap(err)
 	}
 
-	challengeResponse, err := oracleJoinClient.Recv()
+	challengeResp, err := oracleJoinClient.Recv()
 	if err != nil {
 		return nil, trace.Wrap(err)
 	}
-	challenge := challengeResponse.GetChallenge()
+	challenge := challengeResp.GetChallenge()
 	if challenge == "" {
 		return nil, trace.BadParameter("missing challenge")
 	}
-	oracleReq, err := oracleRequestFromChallenge(challenge)
+	oracleSignedReq, err := oracleRequestFromChallenge(challenge)
 	if err != nil {
 		return nil, trace.Wrap(err)
 	}
 	if err := oracleJoinClient.Send(&proto.RegisterUsingOracleMethodRequest{
 		Request: &proto.RegisterUsingOracleMethodRequest_OracleRequest{
-			OracleRequest: oracleReq,
+			OracleRequest: oracleSignedReq,
 		},
 	}); err != nil {
 		return nil, trace.Wrap(err)