lxd/apparmor/instance/qemu: Allow rw access to instance devicesPath
lxd/apparmor/instance/qemu: Allow rw access to instance devicesPath

To allow access to bind mounts of external directories.
We need to allow access to whole directory in order to support hotplugging disks in the future.

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

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