Moved to absolute path for playbook_path... and playbook.basedir

The goal is to mirror the absolute path like what is in {{inventory_dir}}. I just wrapped the two primary places based_dir is used in os.path.realpath.

I tested the code with a few ansible runs however I didn't see any unit tests for playbooks specifically... If you point me to the test sweet I should run for this, I'll run it and update this PR.

Thanks