Refactor: move registries functions to their file

There were same functions from namespace 'registries' in
event_service_manager.hpp. Move them to registries.cpp/hpp.

Tested:
- Using Redfish Event Listener, test subscriptions and eventing.
- Redfish Service Validator passes

Change-Id: Id0912f6581637bb4117e67b138122c355256b561
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/redfish-core/src/event_log.cpp b/redfish-core/src/event_log.cpp
index 5420549..cada5b7 100644
--- a/redfish-core/src/event_log.cpp
+++ b/redfish-core/src/event_log.cpp
@@ -15,7 +15,6 @@
 */
 #include "event_log.hpp"
 
-#include "event_service_manager.hpp"
 #include "logging.hpp"
 #include "registries.hpp"
 #include "str_utility.hpp"
@@ -127,7 +126,7 @@
     const std::string& customText, nlohmann::json::object_t& logEntryJson)
 {
     // Get the Message from the MessageRegistry
-    const registries::Message* message = registries::formatMessage(messageID);
+    const registries::Message* message = registries::getMessage(messageID);
 
     if (message == nullptr)
     {