Add support health monitor system (#15)

Signed-off-by: Petro Bratash <petrox.bratash@intel.com>

device/barefoot/x86_64-accton_as9516_32d-r0/system_health_monitoring_config.json

@@ -0,0 +1,11 @@
+{
+    "services_to_ignore": [],
+    "devices_to_ignore": [],
+    "user_defined_checkers": [],
+    "polling_interval": 60,
+    "led_color": {
+        "fault": "amber",
+        "normal": "green",
+        "booting": "orange_blink"
+    }
+}

device/barefoot/x86_64-accton_wedge100bf_32x-r0/system_health_monitoring_config.json

@@ -0,0 +1,11 @@
+{
+    "services_to_ignore": [],
+    "devices_to_ignore": [],
+    "user_defined_checkers": [],
+    "polling_interval": 60,
+    "led_color": {
+        "fault": "amber",
+        "normal": "green",
+        "booting": "orange_blink"
+    }
+}

device/barefoot/x86_64-accton_wedge100bf_65x-r0/system_health_monitoring_config.json

@@ -0,0 +1,11 @@
+{
+    "services_to_ignore": [],
+    "devices_to_ignore": [],
+    "user_defined_checkers": [],
+    "polling_interval": 60,
+    "led_color": {
+        "fault": "amber",
+        "normal": "green",
+        "booting": "orange_blink"
+    }
+}

platform/barefoot/sonic-platform-modules-bfn-montara/sonic_platform/chassis.py

@@ -212,3 +212,32 @@ def is_replaceable(self):
             bool: True if it is replaceable.
         """
         return False
+
+    def initizalize_system_led(self):
+        self.system_led = ""
+        return True
+
+    def set_status_led(self, color):
+          """
+          Sets the state of the system LED
+
+          Args:
+              color: A string representing the color with which to set the
+                     system LED
+
+          Returns:
+              bool: True if system LED state is set successfully, False if not
+          """
+        self.system_led = color
+        return True
+
+      def get_status_led(self):
+          """
+          Gets the state of the system LED
+
+          Returns:
+              A string, one of the valid LED color strings which could be vendor
+              specified.
+          """
+
+          return self.system_led