lxd/storage/drivers/driver/common: Adds allowUnsafeResize argument to runFiller
lxd/storage/drivers/driver/common: Adds allowUnsafeResize argument to runFiller

And remove image type logic that enabled allow unsafe resize.

This will now be done in a driver specific way.

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

lxc/lxd,hallyn/lxd,hallyn/lxd,hallyn/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,stgraber/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd