Description of problem:
UPI/vsphere installation failed due to wrong config generated in master/worker ignition files without ignitionHost.

Installation failed at wait for bootstrap stage since master can not boot up successfully.
level=info msg="Waiting up to 30m0s for the Kubernetes API at https://api.qeci-2265.qe.devcluster.openshift.com:6443..."
level=error msg="Attempted to gather ClusterOperator status after wait failure: listing ClusterOperator objects: the server could not find the requested resource (get clusteroperators.config.openshift.io)"
level=info msg="Use the following commands to gather logs from the cluster"
level=info msg="openshift-install gather bootstrap --help"
level=fatal msg="waiting for Kubernetes API: context deadline exceeded"

Dig more to find that wrong source link generated when "./openshift-install create ignition-configs".

// Ignition config for the control plane machines. You should copy the contents of the master.ign generated by the installer.
control_plane_ignition = <<END_OF_MASTER_IGNITION
{"ignition":{"config":{"append":[{"source":"https://:22623/config/master","verification":{}}]},"security":{"tls":{"certificateAuthorities":[{"source":"data:text/plain;charset=utf-8;base64,XXXXXXXX","verification":{}}]}},"timeouts":{},"version":"2.2.0"},"networkd":{},"passwd":{},"storage":{},"systemd":{}}
END_OF_MASTER_IGNITION

// Ignition config for the compute machines. You should copy the contents of the worker.ign generated by the installer.
compute_ignition = <<END_OF_WORKER_IGNITION
{"ignition":{"config":{"append":[{"source":"https://:22623/config/worker","verification":{}}]},"security":{"tls":{"certificateAuthorities":[{"source":"data:text/plain;charset=utf-8;base64,XXXXXXXXXXXXXX","verification":{}}]}},"timeouts":{},"version":"2.2.0"},"networkd":{},"passwd":{},"storage":{},"systemd":{}}
END_OF_WORKER_IGNITION

===================================================
For an upi/vsphere, should use clusterdomain instead of apivip.

https://github.com/openshift/installer/blob/master/pkg/asset/ignition/machine/node.go#L36

Version-Release number of the following components:
4.4.0-0.nightly-2020-01-17-192119

How reproducible:
always

Steps to Reproduce:
1. Trigger upi/vsphere installation on v4.4 with install-config.yaml such as:
---
apiVersion: v1
controlPlane:
  hyperthreading: Enabled
  name: master
  replicas: 1
compute:
- hyperthreading: Enabled
  name: worker
  replicas: 0
metadata:
  name: qeci-2265
platform:
  vsphere:
    vCenter: vcsa-qe.vmware.devcluster.openshift.com
    username: xxx
    password: xxx
    datacenter: dc1
    defaultDatastore: xxx
pullSecret: 'xxx'
networking:
  clusterNetwork:
  - cidr: 10.128.0.0/14
    hostPrefix: 23
  serviceNetwork:
  - 172.30.0.0/16
  networkType: OpenShiftSDN
fips: true
baseDomain: qe.devcluster.openshift.com
sshKey: xxx
2.
3.

Actual results:
upi/vsphere installation failed due to wrong source link generated in master/worker ign files.

Expected results:
upi/vsphere installation succeed.

Additional info:
Please attach logs from ansible-playbook with the -vvv flag