refactor(host_port): Unify the hostname lookup function #2996

Job	Run time
Lint	14s
Build Release	51m 16s
IWYU	52m 31s
Build ASAN	41m 21s
Build with jemalloc	48m 9s
macOS	19m 9s
Test ASAN	0s
Test with jemallc (dsn_utils_tests)	3m 55s
Test Release (backup_restore_test)	5m 42s
Test Release (base_api_test)	20m 48s
Test Release (base_test)	3m 10s
Test Release (bulk_load_test)	17m 11s
Test Release (dsn_aio_test)	3m 54s
Test Release (dsn_block_service_test)	3m 8s
Test Release (dsn_client_test)	3m 8s
Test Release (dsn.failure_detector.tests)	5m 31s
Test Release (dsn_http_test)	3m 8s
Test Release (dsn_meta_state_tests)	3m 12s
Test Release (dsn.meta.test)	22m 21s
Test Release (dsn_nfs_test)	3m 7s
Test Release (dsn_ranger_tests)	3m 8s
Test Release (dsn_replica_backup_test)	3m 7s
Test Release (dsn_replica_bulk_load_test)	3m 8s
Test Release (dsn_replica_dup_test)	3m 25s
Test Release (dsn_replica_split_test)	3m 9s
Test Release (dsn.replica.test)	3m 15s
Test Release (dsn_replication_common_test)	3m 7s
Test Release (dsn.replication.simple_kv)	3m 22s
Test Release (dsn.rep_tests.simple_kv)	5m 17s
Test Release (dsn_runtime_tests)	3m 28s
Test Release (dsn_security_tests)	3m 4s
Test Release (dsn_utils_tests)	3m 41s
Test Release (dsn.zookeeper.tests)	3m 13s
Test Release (pegasus_geo_test)	4m 34s
Test Release (pegasus_rproxy_test)	3m 39s
Test Release (pegasus_unit_test)	3m 40s
Test Release (recovery_test)	8m 30s
Test Release (restore_test)	5m 18s
Test Release (security_test)	3m 29s
Test Release (throttle_test)	48m 43s
	7h 13m 12s

Provide feedback