Improve connection error logging (#1109)

* Lower severity of connection error logging when closing the connection
   (the error is very likely to be ignored anyway)
 * Unify logging format

Author: robsdedude

src/neo4j/_async/io/_bolt.py

@@ -1029,12 +1029,23 @@ async def _set_defunct(self, message, error=None, silent=False):
         direct_driver = getattr(self.pool, "is_direct_pool", False)
         user_cancelled = isinstance(error, asyncio.CancelledError)
 
+        if not (user_cancelled or self._closing):
+            log_call = log.error
+        else:
+            log_call = log.debug
         if error:
-            log.debug(
-                "[#%04X]  _: <CONNECTION> error: %r", self.local_port, error
+            log_call(
+                "[#%04X]  _: <CONNECTION> error: %s: %r",
+                self.local_port,
+                message,
+                error,
+            )
+        else:
+            log_call(
+                "[#%04X]  _: <CONNECTION> error: %s",
+                self.local_port,
+                message,
             )
-        if not user_cancelled:
-            log.error(message)
         # We were attempting to receive data but the connection
         # has unexpectedly terminated. So, we need to close the
         # connection from the client side, and remove the address

src/neo4j/_sync/io/_bolt.py

@@ -1029,12 +1029,23 @@ def _set_defunct(self, message, error=None, silent=False):
         direct_driver = getattr(self.pool, "is_direct_pool", False)
         user_cancelled = isinstance(error, asyncio.CancelledError)
 
+        if not (user_cancelled or self._closing):
+            log_call = log.error
+        else:
+            log_call = log.debug
         if error:
-            log.debug(
-                "[#%04X]  _: <CONNECTION> error: %r", self.local_port, error
+            log_call(
+                "[#%04X]  _: <CONNECTION> error: %s: %r",
+                self.local_port,
+                message,
+                error,
+            )
+        else:
+            log_call(
+                "[#%04X]  _: <CONNECTION> error: %s",
+                self.local_port,
+                message,
             )
-        if not user_cancelled:
-            log.error(message)
         # We were attempting to receive data but the connection
         # has unexpectedly terminated. So, we need to close the
         # connection from the client side, and remove the address