[undercloud-deploy] Add ability to override ironic httpd ipxe port

This is needed for tripleo-ci and is the quickstart equivalent of:
https://git.openstack.org/cgit/openstack-infra/tripleo-ci/commit/?id=2c9257747261d3ac5b0741187e84a724176536b0

Change-Id: I6a4dae61fa5c750499aac4bc4ededf0803600759

roles/undercloud-deploy/README.md

@@ -21,6 +21,8 @@ to the undercloud install log file.
 used as the base for the network-environment for tripleo.
 - `undercloud_hieradata_override_file`: <'quickstart-hieradata-overrides.yaml.j2'> -- the name of
 jinja template used to override the undercloud's install hieradata
+- `undercloud_ironic_ipxe_port`: <'3816'> -- port to use for httpd ipxe server
+for ironic deploy
 - `step_introspect`: <'false'> -- boolean value to enable/disable ironic introspection
 - `bash_deploy_ramdisk`: <'false'> -- the variable allows older versions of tripleo to upload images
 properly with the option --old-deploy-image

roles/undercloud-deploy/defaults/main.yml

@@ -27,5 +27,9 @@ network_environment_args:
 # not require privileged access (but does require the setup performed by the
 # `environment/setup` role).
 libvirt_uri: qemu:///session
+
+# port to use for httpd ipxe server for ironic deploy
+undercloud_ironic_ipxe_port: 3816
+
 enable_vbmc: true
 undercloud_conf_extra: ""

roles/undercloud-deploy/templates/quickstart-hieradata-overrides.yaml.j2

@@ -3,6 +3,10 @@
 # the value of libvirt_uri into /etc/ironic/ironic.conf.
 ironic::drivers::ssh::libvirt_uri: '{{libvirt_uri}}'
 
+# The default httpd ipxe port is 8080, but this conflicts with the telnet
+# server which streams the console log in CI. So we allow override here.
+ironic::drivers::deploy::http_port: '{{undercloud_ironic_ipxe_port}}'
+
 # The following are configurations for the different workers for the undercloud
 # services.
 {% if undercloud_workers is defined %}