ensure copy exists on DataStore too

lib/msf/core/data_store.rb

@@ -275,6 +275,18 @@ class DataStore < Hash
     list.each(&block)
   end
 
+  #
+  # Return a deep copy of this datastore.
+  #
+  def copy
+    clone = self.class.new
+    self.keys.each do |k|
+      clone.import_option(k, self[k].kind_of?(String) ? self[k].dup : self[k], @imported[k], @imported_by[k])
+    end
+    clone.aliases = self.aliases.dup
+    clone
+  end
+
 protected
 
   #