The files in tools/vnc-container allow a container image to be built
which supports Ironic's graphical console functionality.
For each node with an enabled graphical console, the service ironic-novncproxy
(or nova-novncproxy) will connect to a VNC server exposed by a container
running this image.
If the devstack ir-novnc serivce is enabled then this container image
will be built locally and ironic configured to used it for the systemd
console container provider.
This makes a devstack environment functional in accessing graphical
consoles for Dell, HPE and Supermicro.
Related-Bug: 2086715
Change-Id: I0842570cca22ac0e67d358c30225e8e08561f459
4ed44172b4