How to add the option into or modify sshd_config in undercloud with hieradata_override.

Issue

• How to add the option into or modify sshd_config in undercloud with hieradata_override.

• Without customization, openstack undercloud install will modify sshd_config to the following configuration.

  # cat /etc/ssh/sshd_config 
  # File is managed by Puppet
  Port 22
  
  AcceptEnv LANG LC_*
  ChallengeResponseAuthentication no
  HostKey /etc/ssh/ssh_host_rsa_key
  HostKey /etc/ssh/ssh_host_ecdsa_key
  HostKey /etc/ssh/ssh_host_ed25519_key
  PrintMotd no
  Subsystem sftp /usr/libexec/openssh/sftp-server
  UsePAM yes
  X11Forwarding yes
  

• By this modification, sshd writes its log into /var/log/messages not /var/log/secure. RHEL's default is AUTHPRIV facility in sshd_config.