Description of problem:
The undercloud ctrl_plane ip is included in the ssh_known_host entry for every host e.g:

[root@computehciovsdpdk-1 ~]# cat /etc/ssh/ssh_known_hosts
# BEGIN ANSIBLE MANAGED BLOCK
[192.0.90.19]*,[computehciovsdpdk-0.localdomain]*,[computehciovsdpdk-0]*,[10.10.130.176]*,[computehciovsdpdk-0.internalapi]*,[computehciovsdpdk-0.internalapi.localdomain]*,[10.10.131.185]*,[computehciovsdpdk-0.tenant]*,[computehciovsdpdk-0.tenant.localdomain]*,[10.10.132.154]*,[computehciovsdpdk-0.storage]*,[computehciovsdpdk-0.storage.localdomain]*,[10.10.133.171]*,[computehciovsdpdk-0.storagemgmt]*,[computehciovsdpdk-0.storagemgmt.localdomain]*, ssh-rsa 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
[192.0.90.19]*,[computehciovsdpdk-1.localdomain]*,[computehciovsdpdk-1]*,[10.10.130.167]*,[computehciovsdpdk-1.internalapi]*,[computehciovsdpdk-1.internalapi.localdomain]*,[10.10.131.142]*,[computehciovsdpdk-1.tenant]*,[computehciovsdpdk-1.tenant.localdomain]*,[10.10.132.122]*,[computehciovsdpdk-1.storage]*,[computehciovsdpdk-1.storage.localdomain]*,[10.10.133.146]*,[computehciovsdpdk-1.storagemgmt]*,[computehciovsdpdk-1.storagemgmt.localdomain]*, ssh-rsa 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
[192.0.90.19]*,[controller-0.localdomain]*,[controller-0]*,[10.10.130.189]*,[controller-0.internalapi]*,[controller-0.internalapi.localdomain]*,[10.10.131.107]*,[controller-0.tenant]*,[controller-0.tenant.localdomain]*,[10.10.132.173]*,[controller-0.storage]*,[controller-0.storage.localdomain]*,[10.10.133.139]*,[controller-0.storagemgmt]*,[controller-0.storagemgmt.localdomain]*,[10.35.185.73]*,[controller-0.external]*,[controller-0.external.localdomain]* ssh-rsa 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
[192.0.90.19]*,[controller-1.localdomain]*,[controller-1]*,[10.10.130.108]*,[controller-1.internalapi]*,[controller-1.internalapi.localdomain]*,[10.10.131.136]*,[controller-1.tenant]*,[controller-1.tenant.localdomain]*,[10.10.132.118]*,[controller-1.storage]*,[controller-1.storage.localdomain]*,[10.10.133.129]*,[controller-1.storagemgmt]*,[controller-1.storagemgmt.localdomain]*,[10.35.185.68]*,[controller-1.external]*,[controller-1.external.localdomain]* ssh-rsa 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
[192.0.90.19]*,[controller-2.localdomain]*,[controller-2]*,[10.10.130.119]*,[controller-2.internalapi]*,[controller-2.internalapi.localdomain]*,[10.10.131.187]*,[controller-2.tenant]*,[controller-2.tenant.localdomain]*,[10.10.132.174]*,[controller-2.storage]*,[controller-2.storage.localdomain]*,[10.10.133.174]*,[controller-2.storagemgmt]*,[controller-2.storagemgmt.localdomain]*,[10.35.185.66]*,[controller-2.external]*,[controller-2.external.localdomain]* ssh-rsa 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


Version-Release number of selected component (if applicable):
16.1

How reproducible:
always

Steps to Reproduce:
1. deploy overcloud
2. inspect /etc/ssh/ssh_known_hosts on any node

Actual results:
Every host entry contains the undercloud ctrl_plane ip

Expected results:
Each host entry only contains IPs/fqdns for the host in question

Additional info:
Forked from https://bugzilla.redhat.com/show_bug.cgi?id=1845957