manager: define erase method

The erase method can erase an entry object specified by id.

Change-Id: I86bb2a214b8cf9b951af37f69767ff025f2f5fd0
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
diff --git a/log_manager.cpp b/log_manager.cpp
index e497ae0..11c4392 100644
--- a/log_manager.cpp
+++ b/log_manager.cpp
@@ -178,5 +178,14 @@
     }
 }
 
+void Manager::erase(uint32_t entryId)
+{
+    auto entry = entries.find(entryId);
+    if(entries.end() != entry)
+    {
+        entries.erase(entry);
+    }
+}
+
 } // namespace logging
 } // namepsace phosphor