Support Ansible diff mode

Adds a '--diff' argument to kayobe CLI commands. This is passed through
to ansible-playbook for Kayobe Ansible playbooks, and can be used with
the '--check' argument to see changes that would be made to files.

This change also passes through --check and --diff arguments to
kolla-ansible.

Story: 2009038
Task: 42794

Change-Id: I350795c328c0dc0a91a5cd500c252c5b7b1eafc1