fix(duplication): prevent plog files from being removed by GC while they are being checked by duplication #2802

Job	Run time
Lint	14s
Build with jemalloc	47m 23s
Build ASAN	41m 17s
macOS	58m 3s
Build Release	51m 8s
IWYU	50m 19s
Test ASAN	0s
Test with jemallc (dsn_utils_tests)	4m 17s
Test Release (backup_restore_test)	5m 26s
Test Release (base_api_test)	22m 13s
Test Release (base_test)	3m 8s
Test Release (bulk_load_test)	17m 39s
Test Release (dsn_aio_test)	3m 8s
Test Release (dsn_block_service_test)	3m 41s
Test Release (dsn_client_test)	3m 5s
Test Release (dsn.failure_detector.tests)	5m 27s
Test Release (dsn_http_test)	3m 5s
Test Release (dsn_meta_state_tests)	3m 10s
Test Release (dsn.meta.test)	37m 21s
Test Release (dsn_nfs_test)	3m 4s
Test Release (dsn_ranger_tests)	3m 3s
Test Release (dsn_replica_backup_test)	3m 5s
Test Release (dsn_replica_bulk_load_test)	3m 5s
Test Release (dsn_replica_dup_test)	3m 21s
Test Release (dsn_replica_split_test)	3m 8s
Test Release (dsn.replica.test)	3m 57s
Test Release (dsn_replication_common_test)	3m 4s
Test Release (dsn.replication.simple_kv)	7m 57s
Test Release (dsn.rep_tests.simple_kv)	5m 19s
Test Release (dsn_runtime_tests)	3m 18s
Test Release (dsn_security_tests)	3m 4s
Test Release (dsn_utils_tests)	3m 36s
Test Release (dsn.zookeeper.tests)	3m 10s
Test Release (pegasus_geo_test)	4m 39s
Test Release (pegasus_rproxy_test)	5m 21s
Test Release (pegasus_unit_test)	3m 36s
Test Release (recovery_test)	8m 18s
Test Release (restore_test)	5m 11s
Test Release (security_test)	3m 1s
Test Release (throttle_test)	21m 10s
	7h 43m 31s

Provide feedback