modify getmacs: write lowercase mac address for Firebird blade

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/branches/2.7@13156 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server/lib/xcat/plugins/blade.pm

@@ -1814,6 +1814,7 @@ sub getmacs {
      foreach my $midx ( @midxary) {
        (my $macd,my $mac) = split (/:/,$macs[$midx],2);
        $mac =~ s/\s+//g;
+       $mac =~ s/(.*)/\L$1/g;
        if ($macd !~ /mac address \d/i) {
            return 1,"Unable to retrieve MAC address for interface $midx from Management Module";
        }