[Merge] lp:~thomas-voss/location-service/make-engine-state-persistent-across-boots-and-otas into lp:location-service

[Loïc Minier]

Review: Approve

LGTM
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https://code.launchpad.net/~thomas-voss/location-service/make-engine-state-persistent-across-boots-and-otas/+merge/241784
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