Ecore_Thread excpect resolution of the error and done case to be instantaneous,
while Eina_Future default scheduler linked with Ecore main loop is build around
asynchronous answer. This create a lot of potential. A better patch would be
to provide an Ecore_Thread helper that does the integration properly. Sadly
we are in release now, so this is basically what an helper would do, but
contained inside Efl_Io_Manager.
Depends on D8359