fix(ut): fix the dsn.meta.test using a directorty may has not permission #2984

Job	Run time
Lint	14s
Build Release	49m 11s
Build ASAN	44m 27s
Build with jemalloc	47m 36s
macOS	17m 16s
IWYU	51m 58s
Test ASAN	0s
Test with jemallc (dsn_utils_tests)	4m 22s
Test Release (backup_restore_test)	5m 37s
Test Release (base_api_test)	21m 15s
Test Release (base_test)	3m 8s
Test Release (bulk_load_test)	17m 8s
Test Release (dsn_aio_test)	4m 24s
Test Release (dsn_block_service_test)	3m 47s
Test Release (dsn_client_test)	3m 5s
Test Release (dsn.failure_detector.tests)	5m 32s
Test Release (dsn_http_test)	3m 5s
Test Release (dsn_meta_state_tests)	3m 12s
Test Release (dsn.meta.test)	30m 18s
Test Release (dsn_nfs_test)	3m 5s
Test Release (dsn_ranger_tests)	3m 4s
Test Release (dsn_replica_backup_test)	3m 39s
Test Release (dsn_replica_bulk_load_test)	3m 6s
Test Release (dsn_replica_dup_test)	3m 28s
Test Release (dsn_replica_split_test)	3m 8s
Test Release (dsn.replica.test)	3m 21s
Test Release (dsn_replication_common_test)	3m 6s
Test Release (dsn.replication.simple_kv)	3m 56s
Test Release (dsn.rep_tests.simple_kv)	5m 15s
Test Release (dsn_runtime_tests)	3m 22s
Test Release (dsn_security_tests)	3m 6s
Test Release (dsn_utils_tests)	3m 38s
Test Release (dsn.zookeeper.tests)	3m 9s
Test Release (pegasus_geo_test)	5m 5s
Test Release (pegasus_rproxy_test)	3m 54s
Test Release (pegasus_unit_test)	3m 37s
Test Release (recovery_test)	8m 24s
Test Release (restore_test)	5m 18s
Test Release (security_test)	3m 3s
Test Release (throttle_test)	21m 42s
	6h 55m 1s

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