lxd: Add SquashFS compressed image publish/export support
lxd: Add SquashFS compressed image publish/export support

Signed-off-by: Uzi Erdenebileg <d62aa0b6102e35d846aaabaacc1bf37834395b48@gmail.com>

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