Clustering should sort node names so clustering gets setup correctly

[KlavsKlavsen]

If you don't have the same sorting of hosts in your cluster node list - the servers do not connect to each other - but to whatever node is the first in the list.
I found this, because I pull my list of nodes from puppetdb - and that sorting is "random".. So IMHO the module SHOULD make a note of "first servername - becomes clustername!" - and ensure sorting (wrap node array in sort()) - to be certain the list of nodes are in the same order.