Background_fill autest fails on ubuntu22

[shinrich]

The test fails because the via numbers differ from the gold file. I don't understand the cache very deeply, so hopefully someone more skilled in that area could take a look. Seems like it could be concerning if caching is behaving differently on the Ubuntu platform.

Here is the end of the diff failure for background_fill_0

        * Mark bundle as not supporting multiuse
         < HTTP/1.1 200 OK
         < Access-Control-Allow-Credentials: true
         < Access-Control-Allow-Origin: *
         < Content-Length: 10
         < Content-Type: application/octet-stream
         < Date: Tue, 28 Nov 2023 23:37:16 GMT
         < Age: 6
         < Connection: keep-alive
       - < Via: http/1.1 traffic_server (ApacheTrafficServer/10.0.0 [cMsSfW])
       ?                                                              ^ ^ ^

       + < Via: http/1.1 traffic_server (ApacheTrafficServer/10.0.0 [cWs f ])
       ?                                                              ^ ^ ^

       - ``
       - > GET /drip?duration=4 HTTP/1.1
       - ``
       - < HTTP/1.1 200 OK
       - ``
       - < Via: http/1.1 traffic_server (ApacheTrafficServer/`` [cHs f ])
         < Server: ATS/10.0.0
         <
         { [10 bytes data]
         * Connection #0 to host 127.0.0.1 left intact