Don't detect mdadm RAID in containers

zabbix_scripts/disco_raid_mdadm

@@ -6,11 +6,13 @@ use JSON;
 my $json;
 @{$json->{data}} = ();
 
+if (-x '/bin/systemd-detect-virt' && system('/bin/systemd-detect-virt', '-qc') != 0){
   open FILE, "< /proc/mdstat" or die "Can't open /proc/mdadm : $!";
   foreach my $line (<FILE>) {
     next unless ($line =~ m/^(md\d+)+\s*:/);
     my ($md,undef,$status,$level) = split(/\ /, $line);
     push @{$json->{data}}, {"{#DEVICE}" => $md, "{#STATUS}" => $status, "{#LEVEL}" => $level};
   }
+}
 print to_json($json);
 exit(0);