[Merge] lp:~ssweeny/location-service/cleanups into lp:location-service

[Scott Sweeny]

Scott Sweeny has proposed merging lp:~ssweeny/location-service/cleanups into lp:location-service.

Commit message:
Small fixes around provider loading

Requested reviews:
  Thomas Voß (thomas-voss)
  Konrad Zapałowicz (kzapalowicz)

For more details, see:
https://code.launchpad.net/~ssweeny/location-service/cleanups/+merge/291048

A couple of small refactors previously discussed with tvoss:

 * provider loading loop
 * extracting undecorated provider names

Also, clear any stored daemon options before parsing new ones. They were persisting between test runs, which I believe invalidated the cli tests (happily with this fix they still pass).
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