Optimize on_secret_create & on_innodbcluster_field_backup_schedules handlers #14
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Optimize on_secret_create handler:
the original register handlers all secrets' creation or updating events, then kopf framework transfer every log to k8s event, which overdriving the etcd, in some case this would even trigger OOM on etcd server which cause the k8s master break down.
Optimize on_innodbcluster_field_backup_schedules handler:
when the InnoDBCluster is not created this handler also generates lots of events, I think we should involve a handler dynamically.
when the first InnoDBCluster created, then the handler registers.