Slave IO thread does not handle autoreconnect to restarting Galera Cluster node

Hello,

Considering the following architecture:

• N-nodes MariaDB Galera Cluster
• Standalone MariaDB server replicating from any above cluster node

In the case where the master node is restarted, the slave stops with this error:
1593 The slave I/O thread stops because a fatal error is encountered when it tried to SELECT @master_binlog_checksum. Error: WSREP has not yet prepared node for application use

It has to be restarted manually (START SLAVE) in order to reconnect

As Galera replication implies that, when a node is restarted, there is a short time when the node is available on port 3306, but the node cannot accept commands because it is processing an Incremental State Transfer request, I propose to have the slave thread autoreconnect instead of stopping when it encounters this particular error.