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kbelyavs 
box.ctl: implement a trigger on any control events

Supported control events:
* Completion of recovery of all system spaces. Called on finish of
  bootstrap or finish of join or snapshot recovery.
* Completion of local recovery. Called on finish of bootstrap or
  finish of recovery.
* Switch to read only/read write mode.
* Replicaset add/remove. Called on changes replica set.
* Controlled shutdown.
* Replica error event. Replica fails with some error.

Errors inside triggers are logged and don't influence on instance
behaviour.

All supported control events are exported to Lua as a constants
within namespace box.ctl.event, here is a full list:
 - SYSTEM_SPACE_RECOVERY
 - LOCAL_RECOVERY
 - READ_ONLY
 - READ_WRITE
 - SHUTDOWN
 - REPLICASET_ADD
 - REPLICASET_REMOVE
 - REPLICA_CONNECTION_ERROR

Introduce new configuration option: 'on_ctl_event' with type
function and one one argument - context.
For every events context has required field 'type', one of
constants mentioned above.
For REPLICASET_ADD, REPLICASET_REMOVE and REPLICA_CONNECTION_ERROR
an additional field 'replica_id' is also available.

Usage example. In Lua script a callback function with actions on
specific controlled events must be defined, e.g:
local function onctl(ctx)
    if ctx.type == box.ctl.event.SYSTEM_SPACE_RECOVERY then
        -- specific action #1
    elseif ctx.type == box.ctl.event.LOCAL_RECOVERY then
        -- specific action #2
    ...
    end
end

Then this function passed as a parameter to box.cfg:
on_ctl_event = onctl

Closes #3159

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Jobs
ID Job ID Ran Files Coverage
3 13378.3 (TARGET=coverage) 303
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 Travis Job 13378.3
Source Files on build 13378