Ensure config directory exists for container ironic-pxe
Ensure config directory exists for container ironic-pxe

Config directory for ironic-pxe should be created before copying files into it

Change-Id: I5ad8e44273c3d185cf7fbe94787aff47595aabb0
Closes-Bug: #1518330

mrangana/kolla,stackforge/kolla,mandre/kolla,coolsvap/kolla,toby82/kolla,openstack/kolla,limamauricio/mykolla,dardelean/kolla-ansible,openstack/kolla,limamauricio/mykolla,intel-onp/kolla,negronjl/kolla,rahulunair/kolla,dardelean/kolla-ansible,rahulunair/kolla,mandre/kolla,mandre/kolla,tonyli71/kolla,GalenMa/kolla,stackforge/kolla,GalenMa/kolla,mrangana/kolla,toby82/kolla,nihilifer/kolla,intel-onp/kolla,coolsvap/kolla,stackforge/kolla,toby82/kolla,tonyli71/kolla,dardelean/kolla-ansible,limamauricio/mykolla,nihilifer/kolla,coolsvap/kolla,negronjl/kolla,negronjl/kolla