Comment 4 for bug 1934154

Reviewed: https://review.opendev.org/c/starlingx/ansible-playbooks/+/798909
Committed: https://opendev.org/starlingx/ansible-playbooks/commit/7374b81251a3b5b60e38238e4c679fa5215ffd0c
Submitter: "Zuul (22348)"
Branch: master

commit 7374b81251a3b5b60e38238e4c679fa5215ffd0c
Author: Yuxing Jiang <email address hidden>
Date: Wed Jun 30 09:32:52 2021 -0500

    Check and add remote host key into known_hosts

    The previous method of updating SSH known hosts removes the existing
    host key of the ansible remote host. This commit changes this method
    to scan and add the new ssh key of the ansible remote host into
    ~/.ssh/known_hosts. After this change, the ssh connection to the
    ansible remote host will be accepted if the ansible remote host has
    either the former key or the latter key.

    Test see in:
    https://review.opendev.org/c/starlingx/ansible-playbooks/+/798918

    Partial-Bug: 1934154
    Signed-off-by: Yuxing Jiang <email address hidden>
    Change-Id: I7c56e130ad8b75f5c8ffead0b2041a5dedac6343