Add support for --pid=host

[mattsmitton]

🙍 Problem Statement

It isn't possible to run auditd in docker without specifying --pid=host.

❔ Possible Solution

Add a driver option to specify --pid.

⤴️ Describe alternatives you've considered

n/a

➕ Additional context

See: https://docs.docker.com/engine/reference/run/#pid-settings---pid