Set the Password Complexity Policy on Ubuntu using Landscape

We need a script that can set the password complexity policy. Beyond pushing this policy out to each machine through Landscape, there needs to be a means to audit the Ubuntu estate, and use Landscape annotations to ensure machines have this policy applied.

These password complexity policy settings can be configured in **/etc/pam.d/common-password**

Relevant security discourse post: https://discourse.ubuntu.com/t/security-users/11881

Start with /etc/pam.d/common-password and the linked security discourse post to understand the password complexity settings. Then examine how Landscape can push changes and use annotations across the Ubuntu estate. Done means the policy can be deployed, audited, and represented through Landscape annotations.

Written by the indexing model from the issue text.