Previously get_mac_address on a ThreadInterface returned the EUI-64
reported by the radio driver. This was required for commissioning, but
was inconsistent with other interfaces, and the API concept.
5.9.0 inadvertently changed this so that get_mac_address returned the
actual MAC address used by the radio, which is a hash result of the
EUI-64 for Thread.
The original "return the EUI-64" form was somewhat faulty, as
get_mac_address would not return the EUI-64 set by set_device_eui64() or
another mechanism before connect() was called.
Rather than revert to old behaviour, add a new API to get the device
EUI-64 to ThreadInterface, alongside the existing set API.
Make Nanostack an OnboardNetworkInterface, implementing
add_ethernet_interface so it can use EMAC drivers.
Can now be used via EthernetInterface, and be the system's default
network stack.
Legacy support for NanostackEthernetInterface retained. Some
restructuring of mesh interface code to fit into the
OnboardNetworkStack:::Interface system.
Kevin Bracey
Seppo Takalo