feat(encryption): introduce PegasusEnv #877

Job	Run time
Lint	24s
Build with jemalloc	1h 6m 27s
Build Release	1m 44s
Build ASAN	1h 22m 51s
macOS	56m 42s
IWYU	1h 7m 14s
Test Release	0s
Test with jemallc (dsn_utils_tests)	4m 43s
Test ASAN (backup_restore_test)	7m 19s
Test ASAN (base_api_test)	25m 18s
Test ASAN (base_test)	4m 14s
Test ASAN (bulk_load_test)	25m 37s
Test ASAN (detect_hotspot_test)	16m 2s
Test ASAN (dsn_aio_test)	3m 38s
Test ASAN (dsn_block_service_test)	3m 9s
Test ASAN (dsn_client_test)	3m 43s
Test ASAN (dsn.failure_detector.tests)	5m 38s
Test ASAN (dsn_http_test)	3m 10s
Test ASAN (dsn_meta_state_tests)	3m 17s
Test ASAN (dsn.meta.test)	1h 4m 38s
Test ASAN (dsn_nfs_test)	3m 9s
Test ASAN (dsn_perf_counter_test)	3m 18s
Test ASAN (dsn_replica_backup_test)	3m 57s
Test ASAN (dsn_replica_bulk_load_test)	3m 18s
Test ASAN (dsn_replica_dup_test)	3m 30s
Test ASAN (dsn_replica_split_test)	3m 43s
Test ASAN (dsn.replica.test)	23m 48s
Test ASAN (dsn_replication_common_test)	4m 10s
Test ASAN (dsn.replication.simple_kv)	4m 21s
Test ASAN (dsn.rep_tests.simple_kv)	4m 35s
Test ASAN (dsn_runtime_tests)	3m 29s
Test ASAN (dsn_utils_tests)	5m 10s
Test ASAN (dsn.zookeeper.tests)	3m 12s
Test ASAN (pegasus_geo_test)	4m 57s
Test ASAN (pegasus_rproxy_test)	3m 51s
Test ASAN (pegasus_unit_test)	4m 3s
Test ASAN (recovery_test)	9m 1s
Test ASAN (restore_test)	6m 27s
	9h 3m 47s

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