Update gNOI generated protobufs to fix references.

 * Remove references to the openconfig/reference repo for gNOI
   types import in both protobufs and the Bazel files.
 * Regenerate protobufs using protoc v3.5.1.

Author: robshakir

bgp/bgp.pb.go

@@ -0,0 +1,11 @@
+#!/bin/sh
+set -euo pipefail
+
+proto_imports=".:${GOPATH}/src/github.com/google/protobuf/src:${GOPATH}/src"
+
+# Go
+protoc -I=$proto_imports --go_out=. types.proto
+for p in bgp cert file interface layer2 mpls system; do
+  protoc -I=$proto_imports --go_out=plugins=grpc:. $p/$p.proto
+done
+