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After adding a new node to the cluster, Scylla sends a NEW_NODE event to CQL clients. Some clients immediately try to connect to the new node, however it fails as the node has not yet started listening to CQL requests. In contrast, Apache Cassandra waits for the new node to start its CQL server before sending NEW_NODE event. In practice this means that NEW_NODE and UP events will be sent "jointly" after new node is UP. This change is implemented in the same manner as in Apache Cassandra code. Fixes #7301. Closes #7306