feat(logging): Normalize the output format of 'balance_operation_count' #2977

Job	Run time
Lint	15s
macOS	52m 27s
Build with jemalloc	51m 53s
Build Release	49m 9s
Build ASAN	44m 18s
IWYU	53m 45s
Test ASAN	0s
Test Release (backup_restore_test)	5m 35s
Test Release (base_api_test)	20m 36s
Test Release (base_test)	3m 13s
Test Release (bulk_load_test)	19m 28s
Test Release (dsn_aio_test)	3m 11s
Test Release (dsn_block_service_test)	3m 14s
Test Release (dsn_client_test)	3m 12s
Test Release (dsn.failure_detector.tests)	5m 34s
Test Release (dsn_http_test)	3m 11s
Test Release (dsn_meta_state_tests)	3m 15s
Test Release (dsn.meta.test)	19m 18s
Test Release (dsn_nfs_test)	3m 11s
Test Release (dsn_ranger_tests)	3m 18s
Test Release (dsn_replica_backup_test)	3m 9s
Test Release (dsn_replica_bulk_load_test)	3m 40s
Test Release (dsn_replica_dup_test)	3m 28s
Test Release (dsn_replica_split_test)	3m 20s
Test Release (dsn.replica.test)	3m 27s
Test Release (dsn_replication_common_test)	3m 9s
Test Release (dsn.replication.simple_kv)	3m 31s
Test Release (dsn.rep_tests.simple_kv)	5m 21s
Test Release (dsn_runtime_tests)	3m 27s
Test Release (dsn_security_tests)	3m 5s
Test Release (dsn_utils_tests)	3m 43s
Test Release (dsn.zookeeper.tests)	3m 16s
Test Release (pegasus_geo_test)	4m 35s
Test Release (pegasus_rproxy_test)	3m 41s
Test Release (pegasus_unit_test)	3m 50s
Test Release (recovery_test)	8m 28s
Test Release (restore_test)	5m 14s
Test Release (security_test)	3m 11s
Test Release (throttle_test)	21m 43s
Test with jemallc (dsn_utils_tests)	3m 50s
	7h 25m 11s

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