Add gPTP multiport support to native_posix Ethernet driver.
This means that the driver is able to create more than one
network interface and enable gPTP to each of them. This requires
that net-tools is updated as it contains configuration file
for network interfaces in host side.
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Port all users of 'set_conf_file' to use the built-in rules
instead. This follows the convention-over-configuration principle to
make the system as a whole simpler and more consistent.
Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>