Fix support redirect for local sites.
Review Request #6279 — Created Aug. 27, 2014 and submitted
The "contact support" link wasn't expecting to get a 'local_site_name' argument, and so it caused a 500 error. This change just makes it accept all kwargs and ignore them.
Tool: PEP8 Style Checker Processed Files: reviewboard/admin/views.py Tool: Pyflakes Processed Files: reviewboard/admin/views.py