batcave: adjust playbook to avoid import_playbook deprecating passing vars directly
    
    Hopefully this will fix:
    [DEPRECATION WARNING]: Additional parameters in import_playbook statements are deprecated. Use       'vars' instead. See 'import_playbook' documentation for examples. This feature will be removed in    version 2.14. Deprecation warnings can be disabled by setting deprecation_warnings=False in          ansible.cfg.
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>