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The signal is often received during epoll_wait call, and python code later
checks the value of libc's errno. That value might get tainted by
sighandler, causing errors to be detected after the call (epoll_wait would
return -1 as the call was interrupted by the signal).

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Disabled by default, as it allows code injection in NEO processes to
anyone with the ability to send signals to them and either write access to
NEO product or its controlling TTY.

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If it is still identified, the node would still be referenced in node
manager although having been asked for removal.

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- Don't trash a node to recreate it right after (it was the case when a
  node was known by address only).
- Check node type consistency between:
  - parameters and node found
  - node known by type and node known by UUID
- Log actions before doing them, consistently
- Log found node in addition to loop variables
- Don't call remove when an unknown node is notified as down, and add a
  log for this case

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This simplifies code (and I should have done it this way from the
beginning).
Keep the lock check wrapper in MT subclass as it should have been added in
r2025 anyway.

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When a handler sends a request, always queue the response for handling
within the same handler, possibly delaying further a pending handler
switch.
This is for example required to properly complete identification between
master nodes, as the connecting master node might exit election phase
before receiving peer's AnswerPrimary when peer happens to be the primary.

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If a first packet is sent and its answer received in time, then a second
packet is sent after more than PING_DELAY seconds, a ping will be emitted
right after that second packet, because _ping_time was still set.
This change resets it when there is no pending requests.

Also, as required to have a consistent view of _handlers, check that lock
is properly held in the MT variant of the class.

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If this check fails, hard and soft checks will produce different results.

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conn.getUUID() will always return None on a not-identified-yet node, so
the test was always false when a  was given.
Also, test app.primary_master_node for None instead of primary_uuid, as
the case where an unknown primary UUID is received must be handled.

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There is no need to make a special case in waitStoreResponses if it becomes
equivalent to just calling waitResponses.

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This prevents from having an endless wait on "get" if the last connection
from which we were expecting answers got interrupted.
Note that this method will not raise any error related to this.

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Also, only check if connector is opened when needed, and use new "isClosed"
method on connection.

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