Cleanup the helper scripts

* Remove from __future__ import print_function, because we
  no longer support Python2.
* Clean out unused parts of tools/scripts/scriptCommon.py
* Move appveyorMergeCoverageScript to Python3
* Update user reporting in *release scripts
* Cleanup module imports

tools/scripts/updateDocumentToC.py

@@ -11,8 +11,6 @@
 # https://github.com/rasbt/markdown-toclify
 #
 
-from  __future__  import print_function
-
 import argparse
 import glob
 import os