Fix #2050 Properly clean the installed addon state when the test pilot add-on is uninstalled.
Fix #2050 Properly clean the installed addon state when the test pilot add-on is uninstalled.

lmorchard/testpilot,flodolo/testpilot,mathjazz/testpilot,6a68/testpilot,chuckharmston/testpilot,lmorchard/testpilot,dannycoates/testpilot,mozilla/idea-town-server,lmorchard/testpilot,lmorchard/idea-town,mozilla/idea-town,chuckharmston/testpilot,mathjazz/testpilot,dannycoates/testpilot,meandavejustice/testpilot,6a68/idea-town,mozilla/idea-town-server,dannycoates/testpilot,6a68/testpilot,lmorchard/idea-town-server,mathjazz/testpilot,6a68/idea-town,6a68/idea-town,fzzzy/testpilot,chuckharmston/testpilot,fzzzy/testpilot,meandavejustice/testpilot,lmorchard/idea-town,meandavejustice/testpilot,meandavejustice/testpilot,mozilla/idea-town,dannycoates/testpilot,flodolo/testpilot,fzzzy/testpilot,mozilla/idea-town,chuckharmston/testpilot,lmorchard/idea-town-server,flodolo/testpilot,6a68/testpilot,mozilla/idea-town-server,flodolo/testpilot,lmorchard/idea-town,lmorchard/testpilot,mathjazz/testpilot,6a68/idea-town,mozilla/idea-town,6a68/testpilot,lmorchard/idea-town-server,lmorchard/idea-town-server,lmorchard/idea-town,mozilla/idea-town-server,fzzzy/testpilot