[Bug 2107726] [NEW] Edge case while using `passwd` cmd

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I was changing my sudo password to a new password and this is what
happened:

```
~$ sudo passwd
New password: 
BAD PASSWORD: The password is shorter than 8 characters
Retype new password: 
passwd: password updated successfully

```

- I tried to use the new sudo password and this happened:

```
$ sudo vi /etc/passwd
[sudo] password for ... : 
Sorry, try again.
[sudo] password for ... : 
Sorry, try again.

```

The old password worked, meaning that we have incorrect logging when a
short password is entered twice.

** Affects: shadow (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Edge case while using `passwd` cmd
https://bugs.launchpad.net/bugs/2107726
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