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21fffd29a4
Rationale: if we add more than one sink a number of sink add events are generated. For each event we create a mcast path, right now we do not support Mcast group editing. This means that a new nextobjective will be created for each sink. In particular, this patch enables the mcast group editing to solve the following issue: Sink1 arrives -> fwdObj A -> Next B (this has one output) Sink2 arrives -> fwdObj A -> Next C (this has two outputs) Next B and Next C shares a part of the chain. Reordering happens during the creation of the Nexts: Next C created -> flow A -> Group C Next B created -> flow A -> Group B Failure, traffic does not reach all the sinks. Other side effect is the disalignment between SR app and flow/group because McastHandler believes mcast group is associated to the Next C It includes minor refactoring of the group handler Change-Id: Ib59ba6b63ff411ed46ca8216677046a78cc92ac6