VOL-1596 Add Support for handling multicast groups in OpenOLT Adapter.
VOL-1595 Add Support for handling multicast flows in OpenOLT Adapter.

Depends voltha-protos from the patch below:
https://gerrit.opencord.org/#/c/16690/

Change-Id: I1cc9900bd6400bb31aed11beda674138838a21d2
diff --git a/go.sum b/go.sum
index 916f084..fbf6be6 100644
--- a/go.sum
+++ b/go.sum
@@ -196,11 +196,11 @@
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