[Merge] lp:~thomas-voss/location-service/do-not-rely-on-obsolete-satellite-based-positioning-state into lp:location-service/15.04

[Timo Jyrinki]

Review: Needs Fixing

Two tests failing (in the silo build):

Engine.reads_state_from_settings_on_construction
Engine.stores_state_from_settings_on_destruction
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https://code.launchpad.net/~thomas-voss/location-service/do-not-rely-on-obsolete-satellite-based-positioning-state/+merge/287790
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