If interface-mode doesnt isnt set but there are tagged vlans - set the tagged nautobot attribute #299
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flexible-vlan-tagging is not being read correctly or at all for routers. Switches with interface-mode trunk do have interfaces set as tagged, however Routers with flexible-vlan-tagging cannot import into Nautobot.
I added a work around so that if it cannot find interface-mode trunk/access but it finds tagged vlans, to set the nautobot field "mode" to "tagged"