[Darwin]: Led_manager use sys leds paths and add missing fan module

[aalamsi22]

Description

• Sync Darwin led_manager paths to follow the same /sys/class/leds used on all other platforms.
• Add missing rackmon fan as a fru associated with the FAN led.

Testing

The following sw_tests passed:

• async_logger_test
• fan_service_sw_test
• fsdb_client_test
• platform_config_lib_config_lib_test
• platform_data_corral_sw_test
• platform_helpers_platform_name_lib_test
• platform_manager_config_validator_test
• platform_manager_data_store_test
• platform_manager_device_path_resolver_test
• platform_manager_i2c_explorer_test
• platform_manager_platform_explorer_test
• platform_manager_presence_checker_test
• platform_manager_utils_test
• rackmon_test
• sensor_service_sw_test
• sensor_service_utils_test
• thrift_cow_visitor_tests
• thrift_node_tests
• weutil_crc16_ccitt_test
• weutil_fboss_eeprom_parser_test

The following hw_tests passed:

• data_corral_service_hw_test
• sensor_service_hw_test
• fan_service_hw_test
• weutil_hw_test

Led Manager Testing

Jan 31 00:49:20 ...: I0131 00:49:20.856894  5161 FruPresenceExplorer.cpp:26] Detecting presence of FRUs
Jan 31 00:49:20 ...: I0131 00:49:20.856950  5161 FruPresenceExplorer.cpp:34] Detecting presence of FAN1 (via sysfs)
Jan 31 00:49:20 ...: I0131 00:49:20.857852  5161 FruPresenceExplorer.cpp:49] Detected that FAN1 is present
Jan 31 00:49:20 ...: I0131 00:49:20.857892  5161 FruPresenceExplorer.cpp:34] Detecting presence of FAN2 (via sysfs)
Jan 31 00:49:20 ...: I0131 00:49:20.858802  5161 FruPresenceExplorer.cpp:49] Detected that FAN2 is present
Jan 31 00:49:20 ...: I0131 00:49:20.858819  5161 FruPresenceExplorer.cpp:34] Detecting presence of FAN3 (via sysfs)
Jan 31 00:49:20 ...: I0131 00:49:20.859799  5161 FruPresenceExplorer.cpp:49] Detected that FAN3 is present
Jan 31 00:49:20 ...: I0131 00:49:20.859815  5161 FruPresenceExplorer.cpp:34] Detecting presence of FAN4 (via sysfs)
Jan 31 00:49:20 ...: I0131 00:49:20.860829  5161 FruPresenceExplorer.cpp:49] Detected that FAN4 is present
Jan 31 00:49:20 ...: I0131 00:49:20.860845  5161 FruPresenceExplorer.cpp:34] Detecting presence of FAN5 (via sysfs)
Jan 31 00:49:20 ...: I0131 00:49:20.861801  5161 FruPresenceExplorer.cpp:49] Detected that FAN5 is present
Jan 31 00:49:20 ...: I0131 00:49:20.861817  5161 FruPresenceExplorer.cpp:34] Detecting presence of FAN6 (via sysfs)
Jan 31 00:49:20 ...: I0131 00:49:20.861846  5161 FruPresenceExplorer.cpp:49] Detected that FAN6 is present
Jan 31 00:49:20 ...: I0131 00:49:20.861852  5161 FruPresenceExplorer.cpp:34] Detecting presence of PEM1 (via sysfs)
Jan 31 00:49:20 ...: I0131 00:49:20.861869  5161 FruPresenceExplorer.cpp:49] Detected that PEM1 is present
Jan 31 00:49:20 ...: I0131 00:49:20.861877  5161 LedManager.cpp:45] Programming PEM LED with true
Jan 31 00:49:20 ...: I0131 00:49:20.861911  5161 LedManager.cpp:80] Wrote 1 to file /sys/class/leds/psu_led:green:status/brightness
Jan 31 00:49:20 ...: I0131 00:49:20.861936  5161 LedManager.cpp:80] Wrote 0 to file /sys/class/leds/psu_led:red:status/brightness
Jan 31 00:49:20 ...: I0131 00:49:20.861944  5161 LedManager.cpp:55] Programmed PEM LED with presence true
Jan 31 00:49:20 ...: I0131 00:49:20.861950  5161 LedManager.cpp:45] Programming FAN LED with true
Jan 31 00:49:20 ...: I0131 00:49:20.861972  5161 LedManager.cpp:80] Wrote 1 to file /sys/class/leds/fan_led:green:status/brightness
Jan 31 00:49:20 ...: I0131 00:49:20.861993  5161 LedManager.cpp:80] Wrote 0 to file /sys/class/leds/fan_led:red:status/brightness
Jan 31 00:49:20 ...: I0131 00:49:20.861999  5161 LedManager.cpp:55] Programmed FAN LED with presence true
Jan 31 00:49:20 ...: I0131 00:49:20.862005  5161 LedManager.cpp:25] Programming system LED with true
Jan 31 00:49:20 ...: I0131 00:49:20.862026  5161 LedManager.cpp:80] Wrote 1 to file /sys/class/leds/sys_led:green:status/brightness
Jan 31 00:49:20 ...: I0131 00:49:20.862047  5161 LedManager.cpp:80] Wrote 0 to file /sys/class/leds/sys_led:red:status/brightness
Jan 31 00:49:20 ...: I0131 00:49:20.862054  5161 LedManager.cpp:34] Programmed system LED with true

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