Android: Use LocalServerSocket instead of ServerSocket

Using LocalServerSocket is way much safer than ServerSocket because is
not using ports which might be in use by other applications.

Change-Id: I0e2be0b4561362939950861024f1f95ab819f2c2
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>