Update overcloud IPA URLs

Author: assumptionsandg

etc/kayobe/ipa.yml

@@ -87,7 +87,7 @@ ipa_build_dib_elements_extra:
 #ipa_images_kernel_name:
 
 # URL of Ironic deployment kernel image to download.
-ipa_kernel_upstream_url: "{% if stackhpc_ipa_image_overcloud_enabled | bool %}{{ stackhpc_ipa_image_url }}/ipa.kernel{% endif %}"
+ipa_kernel_upstream_url: "{{ (stackhpc_ipa_image_url + '/ipa.kernel') if stackhpc_ipa_image_overcloud_enabled | bool }}"
 
 # URL of checksum of Ironic deployment kernel image.
 #ipa_kernel_checksum_url:
@@ -99,7 +99,7 @@ ipa_kernel_upstream_url: "{% if stackhpc_ipa_image_overcloud_enabled | bool %}{{
 #ipa_images_ramdisk_name:
 
 # URL of Ironic deployment ramdisk image to download.
-ipa_ramdisk_upstream_url: "{% if stackhpc_ipa_image_overcloud_enabled | bool %}{{ stackhpc_ipa_image_url }}/ipa.initramfs{% endif %}"
+ipa_ramdisk_upstream_url: "{{ (stackhpc_ipa_image_url + '/ipa.initramfs') if stackhpc_ipa_image_overcloud_enabled | bool }}"
 
 # URL of checksum of Ironic deployment ramdisk image.
 #ipa_ramdisk_checksum_url: