fix processing when MN in database and has multiple groups defined

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@14244 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

perl-xCAT/xCAT/Utils.pm

@@ -3070,7 +3070,8 @@ sub noderangecontainsMn
  my @nodelist=$tab->getAllNodeAttribs(['node','groups']);
  foreach my $n (@nodelist) {
   if (defined($n->{'groups'})) {
-   if ($n->{'groups'} eq "__mgmtnode") {  # this is the MN
+   my @groups=split(",",$n->{'groups'});
+   if ((grep (/__mgmtnode/,@groups))) {  # this is the MN
       $mname=$n->{'node'};
       last;
    }