Allow ECC certificates for HTTPS

[marktheknife]

@bob27

If you have disabled HTTP, the only way to recover is to reset the system or use remote administration, if you have that configured.

This endpoint was created for when SSL certificates on the hub was a new thing, but I believe it’ll still work if a user needs to re-enable HTTP access:

@gopher.ny

If something doesn't work, you can disable SSL by going directly to http://your.hubs.ip.here/hub/advanced/disablessl . You should be able to access the UI using plain HTTP right away.