Fix incorrect urls
Fix incorrect urls

'CoreOS deploy kernel' and 'CoreOS deploy ramdisk' have the
wrong urls. Actually, their urls should use the url of each other.

'kernel' should be linked to file 'coreos_production_pxe.vmlinuz'
and 'ramdisk' to file 'coreos_production_pxe_image-oem.cpio.gz'.

Change-Id: I9474a77f62989179e7bd7a8cdf6a1e9f6eecee6d
Co-Authored-By: DongCan <8a32f56d9c07bf2a7cbfc7592806e72b3c428ef1@cn.fujitsu.com>

redhat-openstack/ironic,naterh/ironic,ionutbalutoiu/ironic,NaohiroTamura/ironic,SauloAislan/ironic,ionutbalutoiu/ironic,dims/ironic,hpproliant/ironic,devananda/ironic,bacaldwell/ironic,openstack/ironic,pshchelo/ironic,openstack/ironic,NaohiroTamura/ironic,pshchelo/ironic,bacaldwell/ironic,SauloAislan/ironic,dims/ironic