Fix signal autoconnect creation on inherited classes
Fix signal autoconnect creation on inherited classes

We are not using hasattr/getattr anymore because, if a parent class had a
SignalProxyObject for object_name, it would cause new signals on this
subclass to be ignored

Change-Id: I787b8b094871662a7f1dadb1edbf88fa09da16e9

stoq/kiwi