Implement the ipaddress origin and gateway property

Resolves openbmc/openbmc#1590

Change-Id: I76328e596336f8b8f1394b1927d48ce52f819a66
Signed-off-by: Ratan Gupta <ratagupt@in.ibm.com>
diff --git a/network_manager.hpp b/network_manager.hpp
index bdee889..b19ec72 100644
--- a/network_manager.hpp
+++ b/network_manager.hpp
@@ -86,7 +86,11 @@
          */
         void createInterfaces();
 
-
+        /** TODO: would remove it once we implement the system
+         *  conf dbus object.
+         *  openbmc/openbmc#1295
+         */
+        std::string defaultGateway; // default gateway
     private:
         /** @brief Get all the interfaces from the system.
          *  @returns list of interface names.