Avoid warning spam by flipping to the new callbacks mechanism. These...

Avoid warning spam by flipping to the new callbacks mechanism.  These callbacks are actually never called by rails itself, merely there for plugins

activerecord/lib/active_record/connection_adapters/abstract_adapter.rb

@@ -32,7 +32,7 @@ module ConnectionAdapters # :nodoc:
     class AbstractAdapter
       include Quoting, DatabaseStatements, SchemaStatements
       include QueryCache
-      include ActiveSupport::DeprecatedCallbacks
+      include ActiveSupport::Callbacks
       define_callbacks :checkout, :checkin
 
       @@row_even = true