Update Journal Variable Names

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

Change-Id: Id07900aab1a8f5f6fd13bc4ec5ea5602e8780a8d
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/rtnetlink_server.cpp b/rtnetlink_server.cpp
index c0e5ad5..01d7c10 100644
--- a/rtnetlink_server.cpp
+++ b/rtnetlink_server.cpp
@@ -140,7 +140,7 @@
     if (r < 0)
     {
         log<level::ERR>("Failure Occured in starting of server:",
-                        entry("errno = %d", errno));
+                        entry("ERRNO=%d", errno));
         elog<InternalFailure>();
     }
 }