Prevent mock location from leaking fudger offsets

By using a different location fudger for each provider, and by reseting
the fuger when mock location providers are removed we prevent mock
providers from being used to leak information on the current location
offsets.

Test: presubmits
Change-Id: Ib37c583631c84e01e19352b011ccf8a769f5102c
2 files changed