[bug 1208368] Add a waffle switch to force group invalidation.
[bug 1208368] Add a waffle switch to force group invalidation.

fxa90id/mozillians,akatsoulas/mozillians,mozilla/mozillians,johngian/mozillians,johngian/mozillians,akatsoulas/mozillians,mozilla/mozillians,mozilla/mozillians,johngian/mozillians,fxa90id/mozillians,johngian/mozillians,fxa90id/mozillians,fxa90id/mozillians,akatsoulas/mozillians,mozilla/mozillians,akatsoulas/mozillians