Add support for --pid=host

[mattsmitton]

:frowning_person: Problem Statement

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

:grey_question: Possible Solution

Add a driver option to specify --pid.

:arrow_heading_up: Describe alternatives you've considered

n/a

:heavy_plus_sign: Additional context

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