libnm: NMDeviceEthernet uses PRIO_20 instead of PRIO_30

Fernando Fernández Mancera requested to merge (removed):eth_prio into master

As NMDeviceVeth has a NMDeviceEthernet as parent, it should use PRIO_20 in order to report NMDeviceVeth when configured and do not report NMDeviceEthernet.

An unit test case has been added.

Signed-off-by: Fernando Fernandez Mancera

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