Replace CORE_CLUSTER_JOIN_ADDRESS with CORE_CLUSTER_PEERS. This is
a comma separated list of cluster members with their IDs of the form
ID@host:port
On startup the node tries to connect to all the peers. In case of
sudden deaths of a node this will allow to find back into the
cluster. The list in CLUSTER_PEERS is a starting point of known
peers. Other node that are not in that list can still join the
cluster.
File and stream proxy has been moved to the Proxy type.
