efl_net: make efl.net.server.fd abstract

Authored by Marcel Hollerbach <mail@marcel-hollerbach.de> on Jan 17 2019, 8:14 AM.


efl_net: make efl.net.server.fd abstract

noone instanciantes it directly, further more it has pure_virtual
functions, which are making sense. So making this class abstract does
fix the issue of pure_virtual functions in class.

ref T7632

Depends on D7669

Reviewers: cedric, segfaultxavi, zmike, q66

Reviewed By: segfaultxavi

Subscribers: reviewers, committers

Tags: efl

Maniphest Tasks: T7632

Differential Revision: https://phab.enlightenment.org/D7670