Add support for authorized_keys.d/ignition in OKD

[LorbusChris]

See also #2778

- What I did

commit 22f0fb8e8c38e6da8f3a930ffb2e6f6fcddb3a86
Author: John Fortin <fortinj66@gmail.com>
Date:   Mon Feb 8 17:08:23 2021 -0500

    daemon: Create missing /home/core/.ssh/authorized_keys file on OKD
    
    Ignition on OKD may create dropins in authorized_keys.d instead of a single authorized_keys file, so in order
    to properly manage this file MCO should convert it into a single authorized_keys entry

commit 91c8881805142f21c8a28d60d4b7940b71d1b5a0
Author: Christian Glombek <cglombek@redhat.com>
Date:   Thu Jun 17 14:05:43 2021 +0200

    daemon: Make SSH keys owned by core user
    
    In OKD, the file does not exist and is therefore newly written
    via the atomicallyWriteSSHKey function.
    This change ensures the ownership is explicitly set to the core user
    and group (uid 1000/gid 1000) as it'll otherwise default to root.
    
    Fixes: https://github.com/openshift/okd/issues/655

- How to verify it

OKD e2e

- Description for the changelog
daemon: Create missing /home/core/.ssh/authorized_keys file on OKD
daemon: Make SSH keys owned by core user

cc @fortinj66 @bgilbert

[openshift-ci]

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[openshift-ci]

@LorbusChris: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-workers-rhel7	91c8881	link	false	/test e2e-aws-workers-rhel7
ci/prow/okd-e2e-aws	91c8881	link	false	/test okd-e2e-aws
ci/prow/e2e-aws-workers-rhel8	91c8881	link	false	/test e2e-aws-workers-rhel8
ci/prow/e2e-aws-upgrade-single-node	91c8881	link	false	/test e2e-aws-upgrade-single-node
ci/prow/e2e-agnostic-upgrade	91c8881	link	true	/test e2e-agnostic-upgrade
ci/prow/e2e-aws-disruptive	91c8881	link	false	/test e2e-aws-disruptive

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[LorbusChris]

This will be folded into #2688

/close

[openshift-ci]

@LorbusChris: Closed this PR.

Details

In response to this:

This will be folded into #2688

/close

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