lxd/instance/drivers/driver/qemu: Adds volatile.last_state.vsock_id volatile key
lxd/instance/drivers/driver/qemu: Adds volatile.last_state.vsock_id volatile key

This is used to allow the lxd-agent connection to work during DB record recovery for a running VM.

Improves LXD agent connection failure error.

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

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