SLING-3195 : Provide a property to uniquely identify a Cluster : achieved by making the existing ClusterView.getId stable: the id is stored as part of the votingView and propagates as part of view changes. The initial id is identical to the one chosen for the isolated-mode - hence for one-node cases the clusterView.getId is also stable in that case.

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1537422 13f79535-47bb-0310-9956-ffa450edef68