lvm: don't check in slice for noops
lvm: don't check in slice for noops

Some properties do not require on-disk changes. So don't perform any unnecessary
searches.

Signed-off-by: Christian Brauner <48455ab3070520a2d174545c7239d6d0fabd9a83@ubuntu.com>

erikmack/lxd,stgraber/lxd,hallyn/lxd,Skarlso/lxd,stgraber/lxd,lxc/lxd,lxc/lxd,Skarlso/lxd,stgraber/lxd,georghopp/lxd,hallyn/lxd,lxc/lxd,georghopp/lxd,erikmack/lxd,stgraber/lxd,hallyn/lxd,hallyn/lxd,lxc/lxd,georghopp/lxd,techtonik/lxd,lxc/lxd,hallyn/lxd,hallyn/lxd,Skarlso/lxd,pcdummy/lxd,pcdummy/lxd,techtonik/lxd,stgraber/lxd,mjeanson/lxd,Skarlso/lxd,mjeanson/lxd,mjeanson/lxd,stgraber/lxd,atxwebs/lxd,jsavikko/lxd,lxc/lxd,jsavikko/lxd,erikmack/lxd,jsavikko/lxd,atxwebs/lxd,pcdummy/lxd,atxwebs/lxd,techtonik/lxd,lxc/lxd,atxwebs/lxd,stgraber/lxd