added perf xml test

test/test_perf_xml.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+# Test: XML performance test 
+# See https://github.com/clicon/clixon/issues/96
+# Magic line must be first in script (see README.md)
+s="$_" ; . ./lib.sh || if [ "$s" = $0 ]; then exit 0; else return 0; fi
+
+: ${clixon_util_xml:="clixon_util_xml"}
+
+# Number of list/leaf-list entries in file
+: ${perfnr:=30000}
+
+fxml=$dir/long.xml
+
+new "generate long file $fxml"
+echo -n "<rpc-reply><stdout><![CDATA[" > $fxml
+for (( i=0; i<$perfnr; i++ )); do  
+    echo "*>i10.0.0.$i/32     10.255.0.20              0    100      0 i" >> $fxml
+done
+echo "]]></stdout></rpc-reply>" >> $fxml
+
+new "xml parse long CDATA"
+expecteof_file "time $clixon_util_xml" 0 "$fxml"
+      
+rm -rf $dir
+