Default node ID should be unique
Description
In a cluster, each Openfire node has an identifier (as defined by org.jivesoftware.openfire.XMPPServer#getNodeID). When not running in a cluster, a default value is used.
When joining a cluster, there's a risk that the default value remains in use (at least for a short while).
Currently, the default value is equal on each server, which means that in a cluster, each node will assume that the associated reference was added by the local cluster node.
To prevent issues, the default value used on servers should be unique.
Environment
None
Fixed
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