Handle reconnects for MySQL read replicas with pooling

lib/dialects/mysql/connector-manager.js

@@ -347,7 +347,17 @@ module.exports = (function() {
       if (err.code !== 'PROTOCOL_CONNECTION_LOST') {
         throw err
       }
+
+      if (typeof(pool.destroy) == 'function') {
   	    pool.destroy(client)
+      } else {
+  	    if (pool.read && typeof(pool.read.destroy) == 'function') {
+  		  pool.read.destroy(client)
+  	    }
+  	    if (pool.write && typeof(pool.write.destroy) == 'function') {
+  		  pool.write.destroy(client)
+  	    }
+      }
     })
   }