This will be used for NMTernary properties. The get() method
is still the same as for _pt_gobject_enum, but the setter
and complete functions are more flexible to also allow yes/true
and any unique abbreviations.
This patch is introducing the wired setting accept-all-mac-addresses
property. The value corresponds to the kernel flag IFF_PROMISC.
When accept-all-mac-address is enabled, the interface will accept all
the packets without checking the destination mac address.
Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>