lxd/storage/backend/lxd/patches: Ignores snapshots when retrieving list of custom volumes to be renamed
lxd/storage/backend/lxd/patches: Ignores snapshots when retrieving list of custom volumes to be renamed

Snapshots of custom volumes will be renamed as part of parent volume rename.

Fixes #7076

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

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