Shopping results in 100 scopes take really long to show up

[Łukasz Zemczak]

Not sure what's wrong, but in some cases shopping results take like around 20 seconds to pop up. This was basically breaking test_shopping_lens autopilot tests.

The most trustworthy (but probably not easiest) test case:
1. Start a clean session
2. Open the music scope (Super+M)
3. Search for 'megadeth', wait for results to appear
   -> These appear relatively fast
4. Close the dash
5. Open the home scope (Super)
6. Search for 'playstation'
   -> Notice that you have to wait for the results to appear for above 20 seconds

On jenkins builds similar failures can be found. I think something is wrong with the shopping scope.

[Paweł Stołowski (stolowski)]

The overall performance of the new 100 scopes stack has been dramatically improved in the last 2 weeks and this is no longer the case. Closing this bug as discussed on IRC.