Make HUP for rotate more reliable

salt/suricata/files/suri-rotate.conf

@@ -7,6 +7,6 @@
     create
     sharedscripts
     postrotate
-            docker exec -d so-suricata sh -c 'kill -HUP 6'
+            docker exec -d so-suricata bash -c 'kill -HUP $(cat /var/run/suricata.pid)'
     endscript
-}
+}