veyron/services/mgmt/device/impl: reconcile app states on restart
veyron/services/mgmt/device/impl: reconcile app states on restart

Add support to the device manager to determine the state of previously
started applications on start and track these applications going
forward.

Change-Id: I7b34408b0b0f5c505a8536fb97dda5ee651a8c7c

vanadium/go.v23,vanadium/go.v23,vanadium/go.v23