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Don't break installation when the local db root user has no password

Description

Don't break installation when the local db root user has no password

Reverts broken patch 0cf4e92d; it seems to have been intended to
validate the *to be created* db username/pass, but instead it
validates the *installation username/pass*. This made it impossible
to install if your db user had no password, as on many default dev
installations.

Bug: T85281
Change-Id: I0caaf8b9a244d6f4dad0cba32c566ea557f77fcc