[Merge] lp:~thomas-voss/location-service/add-policy-to-invalidate-3g-radio-cells into lp:location-service

[Loïc Minier]

Review: Approve

Proposed fix is confirmed to work:
Jussi Virtanen's email from 30th:
"""
-          3G cell invalidation after 60 seconds seems to work. [could not figure out error, where to comment this]
"""
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https://code.launchpad.net/~thomas-voss/location-service/add-policy-to-invalidate-3g-radio-cells/+merge/235530
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