VOL-1460 Making go build point to committed google protos. Updating to build openolt proto.

Change-Id: Iea27f7aecae891a067a0496a78dd38e63723c304
diff --git a/protos/voltha_protos/openolt.proto b/protos/voltha_protos/openolt.proto
index ddc8f74..57ea9c2 100644
--- a/protos/voltha_protos/openolt.proto
+++ b/protos/voltha_protos/openolt.proto
@@ -13,6 +13,9 @@
 // limitations under the License.
 
 syntax = "proto3";
+
+option go_package = "github.com/opencord/voltha-protos/go/openolt";
+
 package openolt;
 import "google/api/annotations.proto";