Add option to set unusable password to changepassword

[Vlastimil Zíma]

I just found out, there is no way to set unusable password for a user using a command changepassword. It's sometimes needed to disable password authentication, e.g. for robot accounts which use third party authentication systems and similar cases. I suggest to add an option, e.g. --set-unusable-password to the changepassword command which would allow this.

[Mariusz Felisiak]

Thanks for this ticket, however the changepassword command was never intended to cover all available options. You can create a custom command in your project or use a small standalone script instead:

UserModel = get_user_model()
user = UserModel._default_manager.db_manager('default').get(username=username)
user.set_password(new_password)
user.set_unusable_password()
user.save()