Diskless replication: trigger a BGSAVE after a config change.
If we turn from diskless to disk-based replication via CONFIG SET, we need a way to start a BGSAVE if there are slaves alerady waiting for a BGSAVE to start. Normally with disk-based replication we do it as soon as the previous child exits, but when there is a configuration change via CONFIG SET, we may have slaves in WAIT_BGSAVE_START state without an RDB background process currently active.
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