improvement(syslog-ng): filter audit prints

since in recent release of scylla audit is enabled by default
we are filtering it by default for the time being.

in some nemesis code we are doing lots of seperate commands which
generate too many audit events, that make our logging system out
of sync with the test flow, and generate false positives.

sdcm/provision/common/utils.py

@@ -30,7 +30,13 @@ def configure_syslogng_target_script(hostname: str = "") -> str:
         write_syslog_ng_destination
 
         if ! grep -P "log {{.*destination\\\\(remote_sct\\\\)" /etc/syslog-ng/syslog-ng.conf; then
-            echo "log {{ source($source_name); destination(remote_sct); }};" >> /etc/syslog-ng/syslog-ng.conf
+            echo "
+        filter filter_sct {{
+            # filter audit out
+            not program(\\"^audit\\");
+        }};
+            " >> /etc/syslog-ng/syslog-ng.conf
+            echo "log {{ source($source_name); filter(filter_sct); destination(remote_sct); }};" >> /etc/syslog-ng/syslog-ng.conf
         fi
 
         if [ ! -z "{hostname}" ]; then