New flaky autopilot test failures in ubuntu_weather_app

[Łukasz Zemczak]

Since some images already, we are getting constant failures in the ubuntu_weather_app test suite. There is always at least one test failure, up to 5-6 at max. Usually these are the same tests failing, one of the following:

- test_refresh_tabs
- test_switch_wind_scale
- test_switch_scale_cancel
- test_switch_scale
- test_switch_service

Example logs can be seen here:
http://ci.ubuntu.com/smokeng/utopic/touch/mako/21:20140510.1:20140506.1/7954/ubuntu_weather_app/

Re-runs usually do not help, sometimes less tests fail, but generally there are always some failures.
Running locally also results in a similar number of test failures.