The nginx module setup in filebeat currently only looks for nginx logs within containers. This commit also enables the default nginx log paths (/var/log/nginx/*.log) when nginx is running directly on the physical host. This allows e.g. filebeat to access nginx logs from Kibana when kibana is not running in an openstack container. Change-Id: Ieec4c185206a0d1d44e04d1667a6ecdfd18bb46e