[Minor] Allow an alternative syslog format

utils/rspamd_stats.pl

@@ -564,6 +564,12 @@ sub log_time_format {
       last;
     }
 
+    # Aug  8 00:02:50 hostname rspamd[66986]
+    elsif (/^\w{3} (?:\s?\d|\d\d) \d\d:\d\d:\d\d \S+ rspamd\[\d+\]/) {
+      $format = 'syslog';
+      last;
+    }
+
     # Skip newsyslog messages
     # Aug  8 00:00:00 hostname newsyslog[63284]: logfile turned over
     elsif ( /^\w{3} (?:\s?\d|\d\d) \d\d:\d\d:\d\d\ \S+ newsyslog\[\d+\]: logfile turned over$/ ) {