VOL-1201 Workaround for Broadcom downstream flow bug
VOL-1201 Workaround for Broadcom downstream flow bug

Broadcom requires a downstream flow to exist in order to do a packet out to an ONU
While setting the EAP flow, the adapter used to create an extra downstream flow always using the same default vlan.
It results in the creation of a multicast group by the BAL API and this sometimes fails and cannot be recovered without restarting the OLT drivers
To go around this the extra flow pushed use a vlan unique per ONU per PON port (4000 - onu_id), this makes the vlan 3743 to 3999 "special" and may render them unusable for regular traffic
We are waiting for an answer from Broadcom

Change-Id: I7b9cbad48ec7a8fb97af749d7e2903ade114b1a7

opencord/voltha,opencord/voltha,opencord/voltha,opencord/voltha,opencord/voltha