stable/redis-ha: Fix graceful Sentinel failover #377
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* Move trigger-failover-if-master.sh from redis to sentinel container ** This fixes failover not working because the sentinel container is already shutting down ** This also fixes failover not working because the Sentinel password isn't injected * Fix preStop scripts not logging to stdout * Create redis-prestop.sh to wait for master change * Add disconnecting all Sentinel clients before shutdown to avoid client errors
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