lxd: Modify compressFile() to support SquashFS
lxd: Modify compressFile() to support SquashFS

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

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