How to add Include statement in the /etc/ssh/sshd_config file in RHOCP4

Issue

• How to add Include statement in the /etc/ssh/sshd_config file in RHOCP4?

• After upgrading from RHOCP 4.12 to 4.13 it was not possible to ssh into the nodes so to fix this issue impose adding the Include /etc/ssh/sshd_config.d/*.conf statement in /etc/ssh/sshd_config file.

• Accessing a node using SSH failing with the follwoing message after openshift upgrade:

  $ ssh -i sshkey core@10.0.0.1
  core@10.0.0.1: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).