Feature: crmd: Set "cluster-name" property to corosync's "cluster_name" by default for corosync-2
Fix: pengine: Use "#cluster-name" in rules for setting cluster-specific instance attributes
Fix: pengine: Use "#site-name" in rules for setting site-specific instance attributes

Node's site-name defaults to cluster-name if unset
Merge pull request #513 from gao-yan/default-cluster-name

Feature: crmd: Set "cluster-name" property to corosync's "cluster_name" by default for corosync-2