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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Those events are not purged at disconnection, ignore them here.

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"was_connected" actually meant "was_not_connected". To avoid using a
negation in variable name, fix its use and values it's set to.

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Such node might have died between connection establishment and answering
identification message, possibly causing ECONNRESET.

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Cleanup actions are only appropriate if such exception happens in receive/
send, so it should not be applied to other possible sources of exceptions.

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Any exception triggered by low-level code should cause a log and
connection closure before being propagated.

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- dump() values
- include oid

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Fixes the following scenario (committing an object):
2 storage nodes: S1 and S2
1 replicas
- store in S1 (1)
- store in S2 (2)
- S1 answers (1) with a conflict
- client resolves the conflict, and sends to S1 (3) and S2 (4)
- S1 answers (3) with ok
- S2 answers (2) with a conflict

Old code raises because object store counter was not 0 on an object for
which a conflict was reported.
New code ignores answers notifying of a conflict if given serial is the
already-resolved conflict.
Split & extend existing tests.

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There are 2 distinct kinds of timeout events:
- an unresponsive node
  This is a connection-level timeout.
  This is handled by the Timeout class, triggering pings and monitoring
  incoming data to decide when remote node is considered dead.
- a "too long" processing from an otherwise responsive node
  This is a per-request timeout.
  This is handled by the HandlerSwitcher class, triggering only
  disconnections when an answer takes too long to arrive (historical
  behaviour, not so useful when exchanging with a single-threaded peer).

Previous implementation mixed both, and had shortcomings (ping would
timeout almost immediately, it was not possible to tell which message
caused a timeout).

Update tests.

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This code appeared obscure upon second read, so I document it.

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Typical case:

- Handler H1 is set
- Send request R1
- Request switch to handler H2 (delayed)
- Request switch to handler H3 (delayed)
- Receive answer A1
- H2 must be discarded and H3 applied on the connection

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- Store None values as NULL column values
- Raise KeyError if the configuration entry is not found

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