The value of tmnxSrrpOperSendFibPopulation specifies the mode used to
send FIB population packets on this SRRP instance.
When the value of tmnxSrrpOperSendFibPopulation is set to 'all',
FIB population packets are sent for every subscriber VLAN.
When the value of tmnxSrrpOperSendFibPopulation is set to
'outerTagOnly', FIB population pakckets are sent only on outer VLANs
when the group interface SAPs are QinQ encapsulated.