Add object/interface update methods

Add methods that handle both adding/updating
objects/interfaces.

Change-Id: I3c682365aad18f439babfb0413f29af05327eead
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/generated.mako.cpp b/generated.mako.cpp
index 235e58a..7a9a38e 100644
--- a/generated.mako.cpp
+++ b/generated.mako.cpp
@@ -24,7 +24,10 @@
         std::make_tuple(
             MakeInterface<
                 ServerObject<
-                    ${i.namespace()}>>::make
+                    ${i.namespace()}>>::make,
+            MakeInterface<
+                ServerObject<
+                    ${i.namespace()}>>::assign
         )
     },
 % endfor