Make ered an application with its own supervision tree #41
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This PR contains some separate commits. It might be better to review them one by one.
Merge ered and ered_cluster processes
The command handling code is moved from ered to ered_cluster. The ered
module becomes just an API module without a process of its own. This
eliminates some duplicated structures and copying between processes.
Change ered_client_sup into to simple_one_for_one supervisor.
App and supervision tree
Ered becomes an application with its own supervision tree.
In the API, connect_cluster/2 replaces start_link/2 and close/1 replaces
stop/1. The processes are added to ered's own supervision tree. An ered
instance monitors the caller and closes down if the owner dies, much like
the controlling process concept in gen_tcp and ssl.
Add info message 'cluster_stopped' sent in ered_cluster:terminate/1
The process traps exits so terminate/1 will run even if the process
crashes.
Unify info messages from ered_client and ered_cluster
Make the messages sent by a standalone ered_client match those sent
by a cluster client for each client, i.e. a map with the keys
msg_type, reason, client_id, addr and the optional fields
cluster_id and master.