entry: store parent reference

Have the entry object store a reference to the error manager, passed via
the entry ctor.

Change-Id: I2c4a8c4c95929ab7005620f44ac17e9654d8e906
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
diff --git a/log_manager.cpp b/log_manager.cpp
index 11c4392..8ab495b 100644
--- a/log_manager.cpp
+++ b/log_manager.cpp
@@ -153,7 +153,8 @@
             static_cast<Entry::Level>(reqLevel),
             std::move(errMsg),
             std::move(additionalData),
-            std::move(objects))));
+            std::move(objects),
+            *this)));
     return;
 }