Fix noVNC failed TCs

- Fix noVNC failed TCs tempest.api.compute.servers.test_novnc.NoVNCConsoleTestJSON.test_novnc:
  * Current noVNC request miss the / prefix in GET header in the websocket upgrade request.
  * Current GET header GET ?token=xxx HTTP/1 can cause "HTTP/1.1 400 Bad Request" error.
  * Fix the issue by adding / prefix and
  # updated request format is: GET /?token=xxx HTTP/1.1 or GET /websockify HTTP/1.1

Related-PRODX: PRODX-28660

Change-Id: I38a91b8e293e39625d08073e2b898451b6126ecb
1 file changed