Cluster updates

By default all nodes in a cluster now get the same configuration.


This version introduces a new configuration entity, "node_groups".  Instead of binding module functionality to a specific node. Configuration is set at node_groip level. By referencing nodes to a node group configuration is mirrored to all nodes within the node_group. 

The default behaviour of a cluster is that all nodes have the same configuration.

It's still possible for nodes to differ in configuration. How this is done is answered by PhenixID Support.