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1. Bind to the same port for both UDP and TCP traffic. Newer members would use TCP. This would require finding an available port with both protocols. This is the option we prefer to try first.
2. Add another port field to InternalDistributedMember
3. Pass the new membership port around outside of InternalDistributedMember. This would probably involve sending it part of the FindCoordinatorResponse, as well as including it in the GMSMembershipView.

For either of this the last two options, we will need to version either InternalDistributedMember itself, or the FindCoordinatorResponse and GMSMembershipView classes. Old members will only receive the UDP port, newer members will receive both ports.

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