KeyError may be raised from many statements here, the try/except give no indications.
Also reduce block indentation for readability and add some comments.

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This packet replace notifyPartitionChange when used by storage's replicator at the end of a single partition replication.
In those case, only one partition was involved and the node concerned must match with the sender identify, causing many useless on the master side.
This packet contains only the partition number that is replicated and implies that the node's cell is now up to date.
It should be sent only by the storage node from replicator and received by master node.

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- testUtil module is now empty, but kept for futur tests.
- NeoTestBase got a new getNextTID() method with a copy/paste from master's transactions manager to generate TIDs.
- testProtocol module no more import getNextTID() from neo.util module
- testTransactions test module is updated to test new features provides by transactions manager.

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Instead of let the ltid in the master app module, the transaction manager keep it and compute the next each time a transaction begins.
The getNextTID() method has moved from util to transactions module.
Last TID collected during recovery is also handled by the transaction manager through setLastTID() method.
Any reference to app.ltid are updated,

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The manager kept track of pending (unfinished) transactions initiated by the client nodes and locked by storage nodes.

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- Handle a node list instead of a single node
- Send only one packet per peer, reduce bandwidth and latency
- Remove the related XXX

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MySQLManager.close() is only used in tests where many connections are opened.
In a storage process, the connection is opened only once and kept until it shutdown.

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Now the broadcastPartitionChanges() method check itself the cell_list content.
- If empty, it does nothing.
- If not empty, it generate itself the next PTID and broadcast the changes.

Remove the related XXX.

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- An update means that the item must be already known
- The __call__ replacement for __str__ might be a false good idea
- Module neo.master.test.connector no more exists
- XXX in client/app.py is related to deleted code.

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- Rollback out of a transaction is not an issue with MySQL.
- Any unimplemented packet type must fallback to default handler and raise UnExpectedPacketError exception.

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- Delayed node acceptation
- Verification process review
- Partition table tweaking improvement required
- Node/Connection state review
- Error packet review

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Objects no more related to currently assigned partitions are flushed from relationnal database since implementation of PartitionTable.dropPartition() in r1228.

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See r1356 and followings.

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- Use the client's service handler because of handler split
- Fix use of identifyToMasterNode()
- Set IDs on packets
- Use new-style packet decoding

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- Don't test the case where no UUID is available, this is ensured by identification handler
- When cluster leave operational state, the PTID *must* not change,fix the assertion.

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