caddy-frontend: Use proper signal for Caddy

Caddy reloads configuration on USR1 not on HUP.

software/caddy-frontend/buildout.hash.cfg

@@ -22,7 +22,7 @@ md5sum = c801b7f9f11f0965677c22e6bbe9281b
 
 [template-apache-frontend]
 filename = instance-apache-frontend.cfg.in
-md5sum = f9d0e64b4aae205c7bb941f5c1c27876
+md5sum = db61a7c0aadba180b7aec6056d2c0019
 
 [template-apache-replicate]
 filename = instance-apache-replicate.cfg.in

software/caddy-frontend/instance-apache-frontend.cfg.in

@@ -755,7 +755,7 @@ worker_processes = 4
 worker_connections = 1024
 slave-configuration-directory = ${caddy-directory:nginx-slave-configuration}
 pid-file = ${directory:run}/nginx.pid 
-nginx-graceful-command = ${:nginx-configuration-verification}; if [ $? -eq 0 ]; then kill -HUP $(cat ${:pid-file}); fi
+nginx-graceful-command = ${:nginx-configuration-verification}; if [ $? -eq 0 ]; then kill -USR1 $(cat ${:pid-file}); fi
 nginx-configuration-verification = ${frontend-nginx-validate:rendered}
 ssl_certificate = ${ca-frontend:cert-file}
 ssl_key = ${ca-frontend:key-file}