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Implement message queue. This change makes poll handle at most one packet per call, instead of handling all pending packets at once.


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Only catch KeyErrors generated when fetching a connection to avoid hiding other exceptions. (missed in r687)


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pass msg_id to register so that we can answer to neoctl request with
right id


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'SecondaryEventHandler', used in the secondary role, is now renamed as
PrimaryMasterEventHandler since a secondary is only connected to the primary. On
the other side, the primary apply the SecondaryMasterEventHandler on it's master
connections.
Factorize code in connection(Closed|Timeout)/peerBroken and avoid some checks of 
conditions that can be assume in specialized handlers.
Clean imports and remove some instance checks.


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- one for bootstrap
- one for monitoring
- one for answer to request
add a dispatcher class to manage messages


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Send StartOperation packet to running storage nodes only.


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- All incoming connections start with the identification handler which will
apply the right handler depending on the current cluster state and the node
type. So we are now sure that a node is well identified, got an UUID and is
registered into the node manager when it leaves the identification handler.
- During service, clietnt and storage nodes have their own handler


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exception during packet decoding or processing.


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one storage node.


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the current cluster state, so the primary master should not change the admin's 
connection handler when doing a state-switch.
Factorise a little the response to an identification request.


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- first, asks which master is the primary
- then, when connected to the primary, request node identification
- then, ask explicitely for partition table and node information, to follow query/answer schema.
Details:
- Master:
 - Move handleAskPrimaryMaster, handleAskNodeInformation and handleAskPartitionTable implementations to base handler to factorise code
 - handleRequestNodeIdentification is not required any more in secondary mode, only handleAskPrimaryMaster
- Client:
 - Make bootstrap handler and master connection behave more similarly to on storage's equivalents
 - Remove PrimaryHandler (moved into PrimaryNotificationsHandler)
 - parse master node configured ip list just once, and register them to node manager just once (in app's __init__)


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- wait for all transaction to finish
- ask all other nodes to shut down if cluster is shutting down


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ignored if we are stopping all storage and master nodes


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thus don't need to be imported.


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table ID.


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since the 'name' handler parameter is not positional-fixed nor a keyword
argument.


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information message to admin node


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partition table


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functions. Factorise check of enum based values and string decoding. 
Unify tuple unpacking by always using parenthesis.


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mistake. Add an helper method on the event manager to retreive a connection from
an UUID.


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