Remove unused library and improve the usage description.
Remove unused library and improve the usage description.

* tools/client-side/mergeinfo-sanitizer.py
  (): Set the 'executable' property, and don't import the unused 're' library.
  (usage): Mention "OPTIONS" in the usage syntax synopsis.

Patch by: Prabhu Gnana Sundar <prabhugs{_AT_}collab.net>


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1302424 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion