Permit Realm to supply email address verification on the fly
A Realm might have more data about a user's account in the backend
database. If email address information is available, the realm could
look this up on the fly to verify incoming commits.
Add a new hasEmailAddress() method to check individual emails and
cache results inside of the IdentifiedUser object for the duration
of the current request/operation scope.
Also add a method to lookup as many possible email variations as
possible, for reporting in error messages or GET /emails API.
Change-Id: I13fec7eb00b1bd6ddcb74323ba7205ee1b2ee42f
12 files changed
