Support private emails

[alexeykazakov]

Private email are not visible to other users.
Users can make their emails private/public in the user profile page.

• Support private emails in Auth back-end - Support private emails in Auth backend #35
• Support email notifications for private emails - Use service account token issued by Auth to get user's email from Auth service fabric8-notification#52
• Add private/public email switch to user profile page - Ability to select Private or Public for the Email address on user profile page openshiftio/openshift.io#1775

[alexeykazakov]

Done