system/skeleton: remove haldaemon

We dropped the hal package quite some time ago, and it's not even a
properly created user.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Acked-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>