libnm-core: drop :interface-name properties on virtual NMSetting types
Remove the virtual :interface-name properties and their getters, and use property overrides to do backward-compat handling when serializing/deserializing. Now when constructing an NMConnection from a hash, if the virtual property is set and the NMSettingConnection property isn't, then the override for NMSettingConnection:interface-name will set that property to the value of the virtual interface-name. And when converting an NMConnection to a hash, the overrides for the virtual properties will return the value of NMSettingConnection:interface-name.
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