Minor fix for shell quoting when sending the empty string over via ssh

(for the -G arg to pw usermod).

tbsetup/setgroups.in

@@ -320,6 +320,8 @@ foreach my $uid (@userlist) {
     print "Updating user $uid record on $control_node.\n";
 
     if ($control_node ne $BOSSNODE) {
+	$groupargument =~ s/\"/\\"/g;
+	
         if (system("$SSH -host $control_node ".
 	           "'$USERMOD $uid -g $project $groupargument'")) {
 	    fatal("Could not modify user $uid record on $control_node.");