Check rocksdb closed before operating #1525

Job	Run time
PR Validation	8m 8s
Integration Tests	14m 34s
Backward compatibility tests	19m 49s
Compatibility Check Java8	20m 30s
Bookie Tests	18m 54s
Build with windows on JDK 11	6m 2s
Client Tests	34m 35s
Replication Tests	22m 56s
Remaining Tests	18m 11s
Build with macos on JDK 11	3m 31s
Compatibility Check Java11	21m 5s
TLS Tests	12m 58s
Compatibility Check Java17	20m 3s
StreamStorage Tests	19m 22s
OWASP Dependency Check	0s
Shell tests	23s
	4h 1m 1s

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