Deal with pam_faildelay

[kizzx2]

If pam_faildelay is active, this script will give false negative.

How to reproduce

• Activate pam_faildelay according to the above page

• Use the script with bash suBF.sh -u root -w wordlist.txt with the following trivial list:

  bad_password
  correct_password
  

Expected behavior

• Best: detect pam_faildelay is running, fetch the correct sleep values, print it out in the output and "do the right thing"
• Next best: Detect pam_faildelay is running, output a warning in the output so the user can decide how to deal with it
• At least: mention pam_faildelay in README.md so users can be aware of this

Actual behavior

Now it just outputs Wordlist exhausted as a false negative