Description of problem:
The file "/etc/ssh/ssh_known_hosts" supports multiple, comma seperated values
for DNS-Names and IPs, so that one can associate multiple names/IPs with one
host key.
The FreeIPA should support host aliases and SSSD should support adding aliases
into the output of the sss_ssh_knownhostsproxy so that one could use either
connect to samplehost.example.com and samplehost.linux.example.com
How reproducible:
   always