Add inventory added and removed to registry

Add registry entries to aid parsing logs.

Tested: Removed entity manager persistence file and
got logs like the following:

{
	"@odata.context": "/redfish/v1/$metadata#LogEntry.LogEntry",
	"@odata.id": "/redfish/v1/Systems/system/LogServices/EventLog/Entries/#1557855925",
	"@odata.type": "#LogEntry.v1_4_0.LogEntry",
	"Created": "2019-05-14T17:45:25+00:00",
	"EntryType": "Event",
	"Id": "1557855925",
	"Message": "F1UL16RISER1 Board with serial number BQWK63400247 was installed.",
	"MessageArgs": [
		"F1UL16RISER1",
		"Board",
		"BQWK63400247"
	],
	"MessageId": "OpenBMC.0.1.InventoryAdded",
	"Name": "System Event Log Entry",
	"Severity": "OK"
}

Change-Id: Id111872121b47395335d8c9e118dc6809a1b7574
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/redfish-core/include/registries/openbmc_message_registry.hpp b/redfish-core/include/registries/openbmc_message_registry.hpp
index 319f663..970d767 100644
--- a/redfish-core/include/registries/openbmc_message_registry.hpp
+++ b/redfish-core/include/registries/openbmc_message_registry.hpp
@@ -220,6 +220,40 @@
             .resolution = "None.",
         }},
     MessageEntry{
+        "InventoryAdded",
+        {
+            .description =
+                "Indicates that an inventory item with the specified model, "
+                "type, and serial number was installed.",
+            .message = "%1 %2 with serial number %3 was installed.",
+            .severity = "OK",
+            .numberOfArgs = 3,
+            .paramTypes =
+                {
+                    "string",
+                    "string",
+                    "string",
+                },
+            .resolution = "None.",
+        }},
+    MessageEntry{
+        "InventoryRemoved",
+        {
+            .description =
+                "Indicates that an inventory item with the specified model, "
+                "type, and serial number was removed.",
+            .message = "%1 %2 with serial number %3 was removed.",
+            .severity = "OK",
+            .numberOfArgs = 3,
+            .paramTypes =
+                {
+                    "string",
+                    "string",
+                    "string",
+                },
+            .resolution = "None.",
+        }},
+    MessageEntry{
         "IntelUPILinkWidthReducedToHalf",
         {
             .description =