users: Add email address field during first boot
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Mostly because administrators won't discover the email address field for the user later on.
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This field is important to be able to run 'reset password' operation.
Tests:
- In stable and testing containers, run first boot wizard. Enter the email address during the first boot and see that it was saved as part of user account. Leave the email address blank and it is possible to proceed. User account show blank email address.
Signed-off-by: Sunil Mohan Adapa sunil@medhas.org