We will replace the bundled version of dashboard and steve with the normal
version to explore how that will work.

Signed-off-by: Mark Yen <[email protected]>

This installs Rancher Manager (but doesn't go through the setup).  This is
not yet very useful.

Signed-off-by: Mark Yen <[email protected]>

We are (at least for now) disabling dashboard extensions to reduce the
amount of stuff we have to worry about. We may end up re-enabling them
before this is merged (after cleanup).

Since ingress doesn't currently work on Windows, use envoy to do SSL
termination and do Kubernetes-level service port forwarding instead.  This
also means it will work without traefik.

We need to override the origin when talking to upstream, as the header
normally contains the downstream port and gets rejected.

Also add a timeout to dashboard setup so we can retry instead of hanging
forever if it doesn't work.

They generate kubeconfig files that have no port, which does not work as we
require port forwarding to reach the server.  To avoid confusing users,
hide the buttons.

- When we create an error, we need to throw in, not drop it on the floor.
- If the host port is not specified, and an existing server is found,
  return that server's port instead of 0.