I removed SetCallback from the Python API's since it wasn't actually useful, and added SetScriptCallbackFunction,
and SetScriptCallbackBody.  So add these to the default constructor test case.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@205494 91177308-0d34-0410-b5e6-96231b3b80d8