pam-auth-update --package prompts interactive debconf

[puneetloya]

Describe the bug

include_recipe 'os-hardening'

pam-auth-update --package prompts for debconf during the chef-run and it fails

Expected behavior
A clear and concise description of what you expected to happen.

Actual behavior

• execute[update-pam] action run

  ================================================================================
  Error executing action run on resource 'execute[update-pam]'

  Mixlib::ShellOut::ShellCommandFailed

  Expected process to exit with [0], but received '255'
  ---- Begin output of /usr/sbin/pam-auth-update --package ----
  STDOUT:
  STDERR: Failed to open terminal.debconf: whiptail output the above errors, giving up!
  Use of uninitialized value $ret in scalar chomp at /usr/share/perl5/Debconf/Client/ConfModule.pm line 132, line 8.
  Use of uninitialized value $ret in split at /usr/share/perl5/Debconf/Client/ConfModule.pm line 133, line 8.
  Use of uninitialized value $ret[0] in string eq at /usr/share/perl5/Debconf/Client/ConfModule.pm line 134, line 8.
  ---- End output of /usr/sbin/pam-auth-update --package ----
  Ran /usr/sbin/pam-auth-update --package returned 255

**OS / Environment**
Ubuntu 14.04
**Chef Version**
```paste below
12.12.15

Cookbook Version

3.2.1

Additional context
using DEBIAN_FRONTEND=noninteractive works, just wondering thats the right solution. if thats true I will put a PR. This used to work before not sure why it would happen right now. Recently we ran a script to make a lot of directories non-writable, not sure if that should cause this.