Markus Mäkelä 060a96d7f3 Send error on client DCB hangup events
Sending an error to the client allows the connector to show more
information to the user when the DCB is closed due to a reason internal to
MaxScale.

The error message states that the connection was killed by MaxScale to
distinct it from the error sent by the server. The error number and SQL
state are still the same as both errors should be treated the same way.
2017-11-15 14:57:28 +02:00
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