Add some comments about how xdsh handles the -E <file>

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@13641 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

perl-xCAT/xCAT/DSHCLI.pm

@@ -1118,6 +1118,9 @@ sub fork_fanout_dsh
         my $rsp = {};
         $rsp->{data}->[0] = "dsh>  Remote_command_started $user_target";
         $$options{'monitor'} && xCAT::MsgUtils->message("I", $rsp, $::CALLBACK);
+        
+        #  execute and remove the /tmp file build which is a copy of the
+        # input -E file
 
         @process_info = xCAT::DSHCore->fork_output($user_target, @dsh_command);
         if ($process_info[0] == -2)