All Stores in Kubernetes follow the same logic for determining the name
of an object.  This change makes it so that CompleteWithOptions defaults
the ObjectNameFunc if it is not specified.  Thus a user does not need to
remember to use ObjectMeta.Name.  Using the wrong field as the name can
lead to an object which has a name that bypasses normal object name
validation.
Signed-off-by: Monis Khan <mkhan@redhat.com>