lxd/instance/drivers: Fix raw.lxc handling for shutdown/stop
lxd/instance/drivers: Fix raw.lxc handling for shutdown/stop

Due to a rework of the raw.lxc handling, the config wouldn't be loaded
when stopping or shutting down a container.  This caused some keys,
e.g. `lxc.signal.*`, to be ignored.

Signed-off-by: Thomas Hipp <5f82c492b3b00e427412d216ce820707a10c51ce@canonical.com>

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