lxd/storage/drivers/driver/dir/utils: Updates setQuota to remove old quota if volID has changed
lxd/storage/drivers/driver/dir/utils: Updates setQuota to remove old quota if volID has changed

Also reinitialises the project when changing quota.

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

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