Fix restart and code review (VictoriaMetrics#912)

On start the daemon may write an empty line.
Log as warning non managed log level.

Thanks Andrew .F. for pointers

ports/OpenBSD/VictoriaMetrics/pkg/vmlogger.pl

@@ -3,16 +3,20 @@
 
 openlog($ARGV[0], "pid", "daemon");
 
+my %lvl_map = (
+    'panic' => LOG_EMERG,
+    'fatal' => LOG_CRIT,
+    'error' => LOG_ERR,
+    'warn'  => LOG_WARNING,
+    'info'  => LOG_INFO,
+);
+
 while (my $l = <STDIN>) {
-  my @d = split /\t/, $l;
-  # go level : "INFO", "WARN", "ERROR", "FATAL", "PANIC":
-  my $lvl = $d[0];
-  $lvl = LOG_EMERG if ($lvl eq 'panic');
-  $lvl = 'crit' if ($lvl eq 'fatal');
-  $lvl = 'err' if ($lvl eq 'error');
-  $lvl = 'warning' if ($lvl eq 'warn');
-  chomp $d[2];
-  syslog( $lvl, $d[2] );
+  my ($lvl, undef, $message) = split /\t/, $_, 3;
+  next unless $message;
+  $lvl = $lvl_map{ lc $lvl } || LOG_WARNING;
+  chomp $message;
+  syslog( $lvl, $message );
 }
 
 closelog();