* tools/dist/dist.sh: Only clean contrib/ notes/ and packages/ if the    release being made is a 1.7.x or later release.    Also, allow the names of the 'md5sum' and 'sha1sum' executables to    be overridden.
* tools/dist/dist.sh: Only clean contrib/ notes/ and packages/ if the
   release being made is a 1.7.x or later release.
   Also, allow the names of the 'md5sum' and 'sha1sum' executables to
   be overridden.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1303987 13f79535-47bb-0310-9956-ffa450edef68

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