[1.0.X] Fixed #10034: the formtools security hash function is now friendlier...

[1.0.X] Fixed #10034: the formtools security hash function is now friendlier to browsers that submit leading/trailing whitespace in form fields. Backport of [10752] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10754 bcc190cf-cafb-0310-a4f2-bffc1f526a37