This change sends an event to segment for when a user is unfrozen.
It also moves freeze and warning event triggers from the autofreeze
chore to the account freeze service.
Change-Id: I5c0522b921b7baf52d6db5eb7ef841c08644a461
This change adds an account freeze service with methods for checking
if a user is frozen, freezing a user, and unfreezing a user.
Furthermore, methods for altering the usage limits of a user or project
have been implemented for use by the account freeze service.
Change-Id: I77fecfac5c152f134bec90165acfe4f1dea957e7