Torch: Allow torch to be toggled off without knowledge of state

Change-Id: I1e7fe91d82f08eb6976bacc3d0eb3a4444af6f4b
Signed-off-by: Roman Birg <roman@cyngn.com>
Torch: signal to framework TorchService not to kill us

Change-Id: I1f7f3d1cde7596919da2132748f02cae25cdf5e8
Signed-off-by: Roman Birg <roman@cyngn.com>