Allow direct use of interfaces in ExtLinks
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This PR allows for a network interface to be directly used in an `ExtLink` rather than creating a new VNIC atop that device. This is necessary to make use of pseudo-devices like OPTE ports, which are directly used by Viona. The preflight routine has a small change to verify that each interface is only used to host (several) VNICs, or a single exclusive `ExtLink`. This current implementation leaves some cosmetic gaps in VNIC numbering (e.g., `[duo_piano_vn_vnic0, opte1, duo_piano_vn_vnic2]`) -- these don't affect the correctness of setup/teardown.
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This PR allows for a network interface to be directly used in an
ExtLinkrather than creating a new VNIC atop that device. This is necessary to make use of pseudo-devices like OPTE ports, which are directly used by Viona.The preflight routine has a small change to verify that each interface is only used to host (several) VNICs, or a single exclusive
ExtLink. This current implementation leaves some cosmetic gaps in VNIC numbering (e.g.,[duo_piano_vn_vnic0, opte1, duo_piano_vn_vnic2]) -- these don't affect the correctness of setup/teardown.