Fixed #17730 - Renamed django.utils.htmlparser to django.utils.html_parser to...

Fixed #17730 - Renamed django.utils.htmlparser to django.utils.html_parser to avoid shadowing stdlib HTMLParser in rare case-sensitivity situations. Thanks un33k for the report and gldnspud for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17607 bcc190cf-cafb-0310-a4f2-bffc1f526a37