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A storage might notify the master after the cluster as fall down to the
verification state.

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This is used by zodbshootout, for example, to only flush storage's cache.

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This should increase process responsiveness when a single _poll call
fetched many packets: as long as packet queue is not empty, no epoll.poll
call was made. This means that outgoing packets were kept in our buffer
until packet queue becomes empty.

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Some requests can be safely ignored when received over a closed connection.
This was previously done explicitly in handlers, but it turns out it would
cause a lot of code duplication. Instead, define the policy on a packet
type basis, and apply it to all packets upon reception, before passing it
to handler.
Also, protect request handlers when they respond, as connection might be
closed.

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Those responses are implemented using Error packets.

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This change has an important effect on "abort" call in client handler: once
primary master node locked a transaction, a client must not be allowed to
abort it (it already asked to commit).
Also, remove parameter value in abortFor (it is the new default behaviour).
Also, document abort a bit more.

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This should improve replication & pack performance.

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- set master_conn to None to clarify disconnection
- purge node pool after closing all connections
- allow restarting polling thread after its shutdown
Also, only start polling thread when needed (side-effect of last point).

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Otherwise, we would check the same chunk multiple times, if last range
check was successful: at this point, we wouldn't know criterion to find
the first row after replicated chunk.

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This caused incorrect object deletions during replication, when a chunk
lacks rows.

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deleteTransaction is used by replication to remove a single transaction but
not its content.

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Otherwise, it might not be called (it connector is not present at
transaction manager's "begin" call time).

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If current chunk size is lesser than maximum, it means latest check for the
whole chunk found a problem. If current smaller check succeeded, move to
the other half and divide size by two.
Also, factorise replication "check...Range" handlers.

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This way, it is clear that test doesn't expect replication to end after
current chunk.

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This prevents lines from next setUp from showing up in test's log.
This is not so nice to have to call it here, but it is probably an
artificial-enough use case to justify this.

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There is no reason why we wouldn't see this when runing individual
tests, I think.

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Also, improve exit condition readability.

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Was enabled accidentally in r2371.

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But make it optional, as some tests might want to stop everything
except clients (stopping single processes is already possible
separately).

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