Inherit from object in all Python classes. This is a "new style"
class. It's best to always use them. In Python 3, all classes are
"new style", so this ensures consistent behavior between 2 and 3.
Change-Id: I958baf19a076a6cf3cc57455f05d24182ac1f005
Signed-off-by: Russell Bryant <rbryant@redhat.com>