This attribute of the 'interface' schema allows the user to prompt what
type of PHY they are expecting this interface to be. It will serve an
immediate and a future purpose.
Immediate: presence of the 'dpdk' device-type in a list of interfaces
will help an upcoming vppapy.mockconfig() to generate a cache without
having to talk to the API. This is useful to generate a pre-compute a
complete vpp.exec based off of an empty VPP dataplane
Future: addition of different PHY types, notably RDMA and
VirtualEthernet types
TESTED:
- Added a unit test to ensure that only is_phy() eligable interfaces
receive the device-type attribute.
- All unit and YAML tests pass.
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