1\ resolve the bug 655, no trace log will be shown any longer
2\ replace minidom with ETree to parse and generate XML in http_server
Merge the PR https://github.com/testkit/testkit-lite/pull/3 for testing 2.3.0-2
Update the Release number for 2.3.0-2
Updated by WeiDong

   1. change default expect_result from "none" to "0"
   2. add log when split xml by set
   3. update function to remove empty set from the testing list, after split xml by set
Update the help for showing correct testkit-lite version