proto/msgpack: Fix encoding INVALID_{TID,OID}
In pre-msgpack protocol an 'INVALID_{TID,OID}' was always decoded as 'None' in NEO/py [1]. But in msgpack protocol this isn't true anymore. An `INVALID_TID` is now decoded as an `INVALID_TID`. And this then leads to errors later [2]. Instead of restoring NEO/py to a pre-msgpack behaviour, we fix this on NEO/go side by encoding 'INVALID_{TID,OID}' to NIL on the wire. This is good as it makes the messages we send smaller. [1] https://lab.nexedi.com/nexedi/neoppod/-/blob/6332112cba979dfd29b40fe9f98d097911fde696/neo/lib/protocol.py#L579-583 [2] With SQLite backend we can see the following exception: Traceback (most recent call last): File "/home/levin/neo/neo/tests/functional/__init__.py", line 192, in start self.run() File "/home/levin/neo/neo/tests/functional/__init__.py", line 288, in run getattr(neo.scripts, self.command).main() File "/home/levin/neo/neo/scripts/neostorage.py", line 32, in main app.run() File "/home/levin/neo/neo/storage/app.py", line 196, in run self._run() File "/home/levin/neo/neo/storage/app.py", line 227, in _run self.doOperation() File "/home/levin/neo/neo/storage/app.py", line 301, in doOperation poll() File "/home/levin/neo/neo/storage/app.py", line 145, in _poll self.em.poll(1) File "/home/levin/neo/neo/lib/event.py", line 160, in poll to_process.process() File "/home/levin/neo/neo/lib/connection.py", line 508, in process self._handlers.handle(self, self._queue.pop(0)) File "/home/levin/neo/neo/lib/connection.py", line 93, in handle self._handle(connection, packet) File "/home/levin/neo/neo/lib/connection.py", line 108, in _handle pending[0][1].packetReceived(connection, packet) File "/home/levin/neo/neo/lib/handler.py", line 125, in packetReceived self.dispatch(*args) File "/home/levin/neo/neo/lib/handler.py", line 75, in dispatch method(conn, *args, **kw) File "/home/levin/neo/neo/storage/handlers/client.py", line 67, in askObject o = app.dm.getObject(oid, at, before) File "/home/levin/neo/neo/storage/database/manager.py", line 484, in getObject before_tid and u64(before_tid)) File "/home/levin/neo/neo/storage/database/sqlite.py", line 336, in _getObject r = q(sql + ' AND tid=?', (partition, oid, tid)) OverflowError: Python int too large to convert to SQLite INTEGER
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