Subprocesses should free file descriptors (here a system-wide lock)
they don't need.

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This disables commit 4a4d2e64.

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MySQL connections remained open, which even led to deadlocks with MySQL 5.5

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This makes dropping of partitions very fast, and should also speed up all
other queries to the 'trans', 'obj' & 'obj_short' tables.

However, it is not enabled due to a bug in MySQL 5.1 & 5.5.

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Threaded mode is the fastest so it's the default for neotestrunner.
Speed is not so important for the test bot, so it keeps running them in
functional mode by default.

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It was broken since commit 4a4d2e64
("client: optimize by not calling lastTransaction at the end of transactions").

This fixes several unit tests like
neo.tests.zodb.testBasic.BasicTests.check_tid_ordering_w_commit

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testVerificationCommitUnfinishedTransactions was failing randomly depending
on whether the cluster was started before or after the storage initializing
connection with the master.

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Also patch ZODB to fix an invalidation bug.

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A ConflictError is raised instead.

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