Adding missing generated code from recent commits.

Also updated generated_code.sh to prevent this from happening in
the future.

Change-Id: Ib282e9b6c762a79d4b4e09bee06b14781cd2a4c1

tests/namespace_test/NamespaceA/NamespaceB/TableInNestedNS.py

@@ -7,6 +7,13 @@ import flatbuffers
 class TableInNestedNS(object):
     __slots__ = ['_tab']
 
+    @classmethod
+    def GetRootAsTableInNestedNS(cls, buf, offset):
+        n = flatbuffers.encode.Get(flatbuffers.packer.uoffset, buf, offset)
+        x = TableInNestedNS()
+        x.Init(buf, n + offset)
+        return x
+
     # TableInNestedNS
     def Init(self, buf, pos):
         self._tab = flatbuffers.table.Table(buf, pos)