jvb: migrate config to secure octo

* Migrating configuration to use secure octo configuration by default

Adding a new JVB_OCTO_RELAY_ID to configure videobridge.relay.relay-id (with a fallback to the old JVB_OCTO_BIND_ADDRESS to be used as relay-id)

* Adding a configuration check to verify that Octo cannot be enabled without the ENABLE_COLIBRI_WEBSOCKET environment variable set to "1"

jvb/rootfs/defaults/jvb.conf

@@ -77,12 +77,10 @@ videobridge {
     }
 
     {{ if $ENABLE_OCTO -}}
-    octo {
+    relay {
         enabled = true
-        bind-address = "{{ .Env.JVB_OCTO_BIND_ADDRESS | default "0.0.0.0" }}"
-        public-address = "{{ .Env.JVB_OCTO_PUBLIC_ADDRESS }}"
-        bind-port = "{{ .Env.JVB_OCTO_BIND_PORT | default "4096" }}"
         region = "{{ .Env.JVB_OCTO_REGION | default "europe" }}"
+        relay-id = "{{ .Env.JVB_OCTO_RELAY_ID | default .Env.JVB_OCTO_BIND_ADDRESS }}"
     }
     {{ end -}}
 }