Make the default value of session header to IPMI2.0 header.

Change-Id: Ib6106198d8ecf89fb1224020144df0b209040cb7
Signed-off-by: Tom Joseph <tomjoseph@in.ibm.com>
diff --git a/message_handler.hpp b/message_handler.hpp
index 7fd1215..457af3e 100644
--- a/message_handler.hpp
+++ b/message_handler.hpp
@@ -72,8 +72,7 @@
         /** @brief Socket channel for communicating with the remote client.*/
         std::shared_ptr<udpsocket::Channel> channel;
 
-        // IPMI 1.5 or IPMI 2.0 Session Header
-        parser::SessionHeader sessionHeader;
+        parser::SessionHeader sessionHeader  = parser::SessionHeader::IPMI20;
 
         /*
          * @brief Create the response IPMI message