lxd/device/nic/ovn: Implements NICState interface by adding State function
lxd/device/nic/ovn: Implements NICState interface by adding State function

Attempts to try and guess the likely IP of the OVN NIC by inspecting the NIC's static IP config and OVN Northbound database for dynamic allocations.

Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

stgraber/lxd,stgraber/lxd,stgraber/lxd,hallyn/lxd,hallyn/lxd,hallyn/lxd,lxc/lxd,lxc/lxd,lxc/lxd,lxc/lxd,atxwebs/lxd,stgraber/lxd,atxwebs/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,atxwebs/lxd,atxwebs/lxd,hallyn/lxd,stgraber/lxd,stgraber/lxd