Changed activeExpireCycle server.masterhost check to iAmMaster in beforeSleep (#11997)
In cluster mode, when a node restart as a replica, it doesn't immediately sync with the master, replication is enabled in clusterCron. It means that sometime server.masterhost is NULL and we wrongly judge it in beforeSleep. In this case, we may trigger a fast activeExpireCycle in beforeSleep, but the node's flag is actually a replica, that can lead to data inconsistency. In this PR, we use iAmMaster to replace the `server.masterhost == NULL` This is an overlook in #7001, and more discussion in #11783.
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