fix: ignore connection errors during pool destruction

There are some issues with older versions of node where errors can
be emitted after `destroy` is called (e.g. EUNREACH, ECONNRESET).
We want to ignore these during pool close.

Author: mbroadst

lib/core/connection/pool.js

@@ -641,6 +641,9 @@ function destroy(self, connections, options, callback) {
         conn.removeAllListeners(eventName);
       }
 
+      // ignore any errors during destruction
+      conn.on('error', () => {});
+
       conn.destroy(options, cb);
     },
     err => {