Implement container image build for kerbside.

This change adds images for Kerbside. Kerbside is a SPICE protocol
native proxy used to expose the new spice-direct console type provided
by Openstack Compute. This allows high fidelity virtual desktop
experiences without requiring transcoding of the console into HTML5
in Horizon, or allowing users direct access to the console ports on
your hypervisors.

Sadly, Red Hat chose to remove SPICE support from qemu in RHEL9, and
Rocky Linux has followed along. You therefore _must_ run the Debian or
Ubuntu container images if you wish to use the ``spice-direct``
console type.

Architecturally Kerbside has two components -- an API service which
turns console access URLs from Nova into URLs to ``.vv`` files, and
a proxy service which actually proxies the SPICE traffic. These are
handled as separate container images here because they're quite
different. One is a WSGI REST API, and the other is a daemon. It is
also likely that deployers would choose to host these on different
machines.

Finally, the proxy service needs to be special cased in load
balancing because it strongly expects to terminate TLS itself. The
haproxy is therefore configured as a layer 4 proxy in this case.

Depends-On: https://review.opendev.org/c/openstack/kolla/+/991249
Change-Id: If60a70745462e1360cfadaab1a5a8d75b7fdeb21
Partial-Bug: #2131793 (spice-direct consoles)
Signed-off-by: Michael Still <mikal@stillhq.com>

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