-Fix runcmd3 to close input of command to properly signal end of input

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@6161 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

perl-xCAT/xCAT/Utils.pm

@@ -903,6 +903,7 @@ sub runcmd3 { #a proper runcmd that indpendently returns stdout, stderr, pid and
     foreach (@indata) {
         print $cmdin $_;
     }
+    close($cmdin);
     my @handles;
     while (@handles = $cmdsel->can_read()) {
         foreach (@handles) {