One workaround is following. This will prevent CUPS to change

  sudo invoke-rc.d cups stop
  sudo vi /etc/cups/printers.conf
Put comment character into row: AuthInfoRequired username,password
  sudo chattr +i /etc/cups/printers.conf
  sudo invoke-rc.d cups start

CUPS can't take attribute immutable out from file. Changing file to read-only 
does not help enough.
If you need to restore file back to original state, run command
  sudo chattr -i /etc/cups/printers.conf

Still waiting for correct fix for this bug...

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cups says "can't promp for authorization" when printing to my samba printer
https://bugs.launchpad.net/bugs/283811
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