[Openais] Order of membership lists.

[Alan Conway]

Are the membership lists passed to the callback cpg_confchg_fn_t and
retruned by cpg_membership_get guaranteed to be in any particular order,
e.g. youngest to oldest?

If not, are all members of the cluster guaranteed to get the membership
list in the same order?

I'm looking for a way to pick a single member of the cluster to respond
to config changes - e.g. to mcast cluster-wide information for new
members.

Cheers,
Alan.