3/3 eina_model: fix inheritance test.
3/3 eina_model: fix inheritance test.

HUMAN_POOPER_IFACE must have ANIMAL_POOPER_IFACE as parent interface,
otherwise the order will be incorrect.

The test were also improved in other ways:
 * use ck_assert_int_eq() instead of fail_if()... it prints the incorrect value
 * check refcount
 * unref models
 * shutdown eina



git-svn-id: a6113611d365f0fc061992be0d1d0b451b434026@68034 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33

jordemort/eina,jordemort/eina,jordemort/eina