Normalization/converting the registry address to just a hostname happens
inside of `command.GetDefaultAuthConfig`. Use this value for the rest of
the login flow/storage.
Signed-off-by: Laura Brehm <laurabrehm@hey.com>
(cherry picked from commit e532eead91)
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>