Update Journal Variable Names

Journal entry variable names should be uppercase.
https://www.freedesktop.org/software/systemd/man/sd_journal_print.html

Change-Id: I074955883c67173c9720f094d494addb85c85e7a
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/dump_manager_main.cpp b/dump_manager_main.cpp
index c437e7f..174adc3 100644
--- a/dump_manager_main.cpp
+++ b/dump_manager_main.cpp
@@ -20,7 +20,7 @@
     if (rc < 0)
     {
         log<level::ERR>("Error occurred during the sd_event_default",
-                        entry("rc=%d", rc));
+                        entry("RC=%d", rc));
         report<InternalFailure>();
         return rc;
     }
@@ -44,7 +44,7 @@
         if (rc < 0)
         {
             log<level::ERR>("Error occurred during the sd_event_loop",
-                            entry("rc=%d", rc));
+                            entry("RC=%d", rc));
             elog<InternalFailure>();
         }
     }