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Just don't use iterkeys on dictionaries, it's the default iterator anyway.

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Connection closure is either wanted by the replication node (-> no log)
or not serious (-> warning).

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1000 transactions is so small that reports showed significant higher values than
with 10000 transactions.

Repeat 2 times instead of 3, so that tests don't take too much time.

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All Partition objects must be updated because all of them may contain an object
of the given transaction, even if the transaction itself is stored in another
storage.

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What testRestartWithMissingStorageFastStartup tested was never broken.
It is wanted that the missing storage is not known in this use case.

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Similar to r2777 but for transactions instead of objects.

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This allows to setup an almost fully functional cluster without additional
processes. Threads are scheduled so that they never run simultaneously,
eliminating most random.
There's still much improvement possible like controlled randomization,
or easier debugging when switching from one thread to another.

As mock objects are not usable in such tests, an API should be implemented to
trace/count any method call we'd like to check.

This fixes test_notifyNodeInformation_checkUnregisterStorage

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- make 'undo' compatible with ZODB 3.9.x
- fix load of original version of object

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- Previous implementation was not able to import transactions with many small
  objects, the client for faster to send a store request than to process its
  answer. If X is the difference of time for these 2 operations, the maximum
  number of objects a transaction could contain was CRITICAL_TIMEOUT / X.
  And HasLock feature can't act as a workaround because it is not working yet.
- Change API of 'on_timeout', which currently only used by HasLock.
- Stop pinging when we wait for an answer. This wastes resources and would
  never recover any bad state.
- Make client connections send pings when they are idle instead.
  This implements keep-alive feature for high availability.
  Start with an non-configurable period of 60 seconds.
- Move processing of ping/pong to handlers.

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