Bug 1871789

Description of problem:
When master machines are created by the installer, it should be possible to SSH to them using `ssh core@<master_ip>`. However, this does not work for me with the current nightly build of OCP4.6. At the same time, I can SSH to bootstrap machine using the same method.

Version-Release number of the following components:
openshift-install: 4.6.0-0.nightly-2020-08-24-034934
RHV: 4.3.11.2-0.1.el7

How reproducible:
100 % (I tried it twice on different RHV environments)

Steps to Reproduce:
1. Prepare install-confing.yaml in a way that is contains your public SSH key. My install-config: http://pastebin.test.redhat.com/895896
2. Run the installer
3. Once the master VMs finish their ignition stage, open one of the master's console in RHV and take note of its IP address.
4. Try SSH to the master VM. I tried it while even explicitly providing my identity file to the ssh command:
ssh -i ~/.ssh/id_rsa core@<master_ip_address>
This is what I got though: http://pastebin.test.redhat.com/895904

Additional info:
I've been using this install-config.yaml for past several weeks and never before had a problem SSHing to master VMs.
Also, it's possible for me to SSH to the bootstrap VM. If I made some configuration mistake (e.g. typo in public SSH key in install-config.yaml), I shouldn't be able to SSH to the bootstrap machine.