common: Add magic symlinks to enable librhsm (subscriptions)

[cgwalters]

These enable librhsm which enables host subscriptions to work in containers
https://github.com/rpm-software-management/librhsm/blob/fcd972cbe7c8a3907ba9f091cd082b1090231492/rhsm/rhsm-context.c#L30

Part of https://github.com/openshift/enhancements/blob/master/enhancements/ocp-coreos-layering.md

You can see this in the rhel8-minimal UBI image:

$ podman run --rm -ti registry.access.redhat.com/ubi8-minimal:latest cat /root/anaconda-ks.cfg  | grep -2 'entitlement-host'

ln -s /run/secrets/etc-pki-entitlement /etc/pki/entitlement-host
ln -s /run/secrets/rhsm /etc/rhsm-host
$

(Where the public source for that kickstart is, no idea)

[jmarrero]

/approve
/lgtm

[openshift-ci]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cgwalters, jmarrero

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [cgwalters,jmarrero]

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Approvers can cancel approval by writing /approve cancel in a comment

[openshift-ci]

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