fault-monitor: Add OperationalStatus Functional monitoring

Currently, the default way is to update the Asserted property of
the LedManager by monitoring the `/xyz/openbmc_project/logging`
object path.

The intent behind this commit is to add another way to monitor the
`xyz.openbmc_project.State.Decorator.OperationalStatus` interface
of the Inventory D-Bus object, and check whether the Inventory
D-Bus object is associated with the LED group D-Bus object, and
then update the Asserted property of the LedManager.

Since both these methods handle the faults differently,
Only ONE of these 2 methods can be enabled and NOT both.

The first way is supported by default. To turn OFF the default way
AND turn ON this second way, Enable monitor-operational-status.

Tested:
- enable `monitor-operational-status` in bbappend file, built successfully.

- Before changing the `OperationalStatus` interface:
  busctl get-property xyz.openbmc_project.Inventory.Manager
  /xyz/openbmc_project/inventory/system/chassis/motherboard/powersupply1
  xyz.openbmc_project.State.Decorator.OperationalStatus Functional
  b true

  busctl get-property xyz.openbmc_project.LED.GroupManager
  /xyz/openbmc_project/led/groups/powersupply1_fault
  xyz.openbmc_project.Led.Group Asserted
  b false

  busctl get-property xyz.openbmc_project.LED.Controller.front_psu
  /xyz/openbmc_project/led/physical/front_psu xyz.openbmc_project.Led.Physical State
  s "xyz.openbmc_project.Led.Physical.Action.Off"

- After changing the `OperationalStatus` interface:
  busctl set-property xyz.openbmc_project.Inventory.
  /xyz/openbmc_project/inventory/system/chassis/motherboard/powersupply1
  xyz.openbmc_project.State.Decorator.OperationalStatus Functional b false

  busctl get-property xyz.openbmc_project.Inventory.Manager
  /xyz/openbmc_project/inventory/system/chassis/motherboard/powersupply1
  xyz.openbmc_project.State.Decorator.OperationalStatus Functional
  b false

  (
	If we have more than 1 LED Group D-Bus object:
	Like: The system/chassis/motherboard/powersupply1 path contains
	      two sets of LEDGroup
	{
        "types":
        {
            "rType": "fru",
            "fType": "fault_led_group"
        },
        "paths":
        [
            "/xyz/openbmc_project/led/groups/powersupply0_fault",
            "/xyz/openbmc_project/led/groups/powersupply1_fault"
        ]
    }
  busctl get-property xyz.openbmc_project.LED.GroupManager
  /xyz/openbmc_project/led/groups/powersupply0_fault xyz.openbmc_project.Led.Group Asserted
  b true
  )

  busctl get-property xyz.openbmc_project.LED.GroupManager
  /xyz/openbmc_project/led/groups/powersupply1_fault xyz.openbmc_project.Led.Group Asserted
  b true

  busctl get-property xyz.openbmc_project.LED.Controller.front_psu
  /xyz/openbmc_project/led/physical/front_psu xyz.openbmc_project.Led.Physical State
  s "xyz.openbmc_project.Led.Physical.Action.Blink"

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I36c47198168028ea2b55804cf66d0285847afbd4
diff --git a/fault-monitor/monitor-main.cpp b/fault-monitor/monitor-main.cpp
index 0b4a5fb..f4e2182 100644
--- a/fault-monitor/monitor-main.cpp
+++ b/fault-monitor/monitor-main.cpp
@@ -1,11 +1,21 @@
+#include "config.h"
+
+#ifdef MONITOR_OPERATIONAL_STATUS
+#include "operational-status-monitor.hpp"
+#else
 #include "fru-fault-monitor.hpp"
+#endif
 
 int main(void)
 {
     /** @brief Dbus constructs used by Fault Monitor */
     sdbusplus::bus::bus bus = sdbusplus::bus::new_default();
 
+#ifdef MONITOR_OPERATIONAL_STATUS
+    phosphor::led::Operational::status::monitor::Monitor monitor(bus);
+#else
     phosphor::led::fru::fault::monitor::Add monitor(bus);
+#endif
     /** @brief Wait for client requests */
     while (true)
     {