lxd/device/nic/sriov: Updates networkGetVirtFuncInfo to use json output from ip tool
lxd/device/nic/sriov: Updates networkGetVirtFuncInfo to use json output from ip tool

Also adds support for newer versions of the ip tool that use "address" rather than "MAC" field for VF hwaddr.

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

lxc/lxd,hallyn/lxd,mjeanson/lxd,lxc/lxd,stgraber/lxd,mjeanson/lxd,lxc/lxd,hallyn/lxd,hallyn/lxd,Skarlso/lxd,atxwebs/lxd,hallyn/lxd,atxwebs/lxd,stgraber/lxd,Skarlso/lxd,mjeanson/lxd,lxc/lxd,stgraber/lxd,lxc/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,Skarlso/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,stgraber/lxd,Skarlso/lxd,atxwebs/lxd,atxwebs/lxd,hallyn/lxd