12298: Prevent duplicate users with gmail openid.
12298: Prevent duplicate users with gmail openid.

I'm not sure why this is happening, but we can work around it by using
the email to lookup the UserProfile object instead of the openid key.

ReachingOut/unisubs,eloquence/unisubs,norayr/unisubs,wevoice/wesub,ReachingOut/unisubs,ReachingOut/unisubs,pculture/unisubs,wevoice/wesub,norayr/unisubs,norayr/unisubs,pculture/unisubs,pculture/unisubs,ujdhesa/unisubs,ofer43211/unisubs,ujdhesa/unisubs,pculture/unisubs,norayr/unisubs,ujdhesa/unisubs,wevoice/wesub,wevoice/wesub,ofer43211/unisubs,eloquence/unisubs,eloquence/unisubs,eloquence/unisubs,ofer43211/unisubs,ofer43211/unisubs,ujdhesa/unisubs,ReachingOut/unisubs