caddy-frontend: Add Cache Lookup URL to the log

The cluc from https://docs.trafficserver.apache.org/en/7.1.x/admin-guide/logging/formatting.en.html#cache-details
allows to track the log entry per the originated request, which basically
makes debugging of ATS behaviour possible.

/reviewed-on nexedi/slapos!689

software/caddy-frontend/buildout.hash.cfg

@@ -82,7 +82,7 @@ md5sum = baf7b89cc9ab5506100b0c900808c1ea
 
 [template-trafficserver-logging-config]
 filename = templates/trafficserver/logging.config.jinja2
-md5sum = 0f30ca0d299d0150b22fe8b0ee12f150
+md5sum = 6aed31174dc262ced02f31624321df41
 
 [template-nginx-eventsource-slave-virtualhost]
 filename = templates/nginx-eventsource-slave.conf.in

software/caddy-frontend/templates/trafficserver/logging.config.jinja2

 squid = format {
-   Format = '%<cqtq> %<ttms> %<chi> %<crc>/%<pssc> %<psql> %<cqhm> %<cquc> %<caun> %<phr>/%<pqsn> %<psct>'
+   Format = '%<cqtq> %<ttms> %<chi> %<crc>/%<pssc> %<psql> %<cqhm> %<cquc> %<cluc> %<caun> %<phr>/%<pqsn> %<psct>'
 }
 log.ascii {
    Format = squid,