Replace occurrences of list_join with Fn::Join
Replace occurrences of list_join with Fn::Join

When change I6730ffe1e27d952d563c16a9480298fbef9f61fe got merged we
introduced some occurrences of list_join which should have been
migrated to Fn::Join (change I039f57ab39c1fcfc319a7a34265ba4fabf4ccd08)

This caused overcloud CI jobs to fail with:
Property error : allNodesConfig: config Items to join must be strings

This change fixes this by replacing newly introduced occurrences
of list_join with Fn::Join

Change-Id: Ibac193781d31d6f81e955e7b9381e13cfdd0ab1d

wyg3958/tripleo-heat-templates,redhat-openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,bcrochet/tripleo-heat-templates,wyg3958/tripleo-heat-templates,bcrochet/tripleo-heat-templates,bcrochet/tripleo-heat-templates,dprince/tripleo-heat-templates,trozet/tripleo-heat-templates,openstack/tripleo-heat-templates,trozet/opnfv-tht,rdo-management/tripleo-heat-templates,trozet/opnfv-tht,dprince/tripleo-heat-templates,redhat-openstack/tripleo-heat-templates,rdo-management/tripleo-heat-templates,trozet/tripleo-heat-templates,trozet/opnfv-tht