CA-410965: Modify default ref of console (#6553)

The `ref` parameter within the `location` attribute of the console can
refer to either the VM's ref or the console's own ref. Currently, the
console's location uses the VM's ref by default.

This causes an issue: when executing xe console, the requested location
contains the VM's ref. If the ref points to the VM, xapi will attempt to
use the RFB console (which is graphical) by default, rather than the
VT100 console (which is text-based). As a result, the xs console command
fails to open the console and hangs.

**Solution:**
Update the default ref in the console's `location` to the console's own
ref. With this change, whether accessing the RFB or the VT100 console,
the ref in the `location` will always point to the respective console
itself.

Author: BengangY

ocaml/xapi/create_misc.ml

@@ -307,7 +307,7 @@ and create_domain_zero_console_record_with_protocol ~__context ~domain_zero_ref
   let location =
     Uri.(
       make ~scheme:"https" ~host:address ~path:Constants.console_uri
-        ~query:[("ref", [Ref.string_of domain_zero_ref])]
+        ~query:[("ref", [Ref.string_of console_ref])]
         ()
       |> to_string
     )