[lxd] add docs on publish properties
[lxd] add docs on publish properties

pecigonzalo/packer,dave2/packer,mitchellh/packer,ChrisLundquist/packer,rnaveiras/packer,pieter-lazzaro/packer,timsutton/packer,KohlsTechnology/packer,p1-nico/packer,dave2/packer,rnaveiras/packer,ChrisLundquist/packer,youhong316/packer,KohlsTechnology/packer,pieter-lazzaro/packer,paulmey/packer,tb3088/packer,youhong316/packer,paulmey/packer,timsutton/packer,pecigonzalo/packer,ChrisLundquist/packer,mkuzmin/packer,timsutton/packer,mkuzmin/packer,paulmey/packer,timsutton/packer,youhong316/packer,hashicorp/packer,KohlsTechnology/packer,mkuzmin/packer,hashicorp/packer,p1-nico/packer,p1-nico/packer,routelastresort/packer,ricardclau/packer,bryson/packer,markpeek/packer,arizvisa/packer,tb3088/packer,bryson/packer,paulmey/packer,taliesins/packer,tb3088/packer,taliesins/packer,tas50/packer,tb3088/packer,rnaveiras/packer,markpeek/packer,bryson/packer,p1-nico/packer,grubernaut/packer,rnaveiras/packer,hashicorp/packer,arizvisa/packer,tb3088/packer,p1-nico/packer,arizvisa/packer,taliesins/packer,pieter-lazzaro/packer,ChrisLundquist/packer,ricardclau/packer,pieter-lazzaro/packer,tas50/packer,routelastresort/packer,KohlsTechnology/packer,dave2/packer,pecigonzalo/packer,KohlsTechnology/packer,paulmey/packer,grubernaut/packer,grubernaut/packer,mitchellh/packer,arizvisa/packer,rnaveiras/packer,dave2/packer,dave2/packer,markpeek/packer,tas50/packer,ricardclau/packer,markpeek/packer,rnaveiras/packer,tas50/packer,tb3088/packer,ricardclau/packer,pieter-lazzaro/packer,grubernaut/packer,grubernaut/packer,taliesins/packer,p1-nico/packer,timsutton/packer,mkuzmin/packer,mitchellh/packer,mkuzmin/packer,mitchellh/packer,youhong316/packer,pecigonzalo/packer,markpeek/packer,markpeek/packer,ricardclau/packer,KohlsTechnology/packer,tas50/packer,taliesins/packer,bryson/packer,arizvisa/packer,routelastresort/packer,routelastresort/packer,bryson/packer,hashicorp/packer,youhong316/packer,tas50/packer,arizvisa/packer,ricardclau/packer,ChrisLundquist/packer,dave2/packer,bryson/packer,mitchellh/packer,mkuzmin/packer,ChrisLundquist/packer,taliesins/packer,timsutton/packer,youhong316/packer,paulmey/packer,routelastresort/packer,grubernaut/packer,pieter-lazzaro/packer