This patch updates the domain for federated users to be the domain of
the Identity Provider (IdP).
Closes-Bug: #1642687
Partially-Implements: bp support-federated-attr
Depends-On: If8c8ad39c4c55a2d800bf4432411db59799e84e6
Change-Id: Iccfad6f39dc339ca054bedf3c6882c3701dcf0ec