Several improvement related to Aurora #3515
Merged
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Solve various issues.
a) it handles also replicas where REPLICA_LAG_IN_MILLISECONDS == 0
b) ignore decommissioned or renamed nodes, see #3484
c) during a failover, the former writer (still reporting MASTER_SESSION_ID) is not considered a writer if it is not the last updated
d) increases the amount of entries stored in mysql_server_aws_aurora_log from 50 to 150 snapshots (more history)
This PR also removed unused code