Change in Ooyala API makes Ooyala module not connect

The Ooyala API recently started returning a server error 400 instead of 200 OK when visiting the http://api.ooyala.com/partner/query URL directly. This changes makes it so that the Ooyala module doesn't realize it can connect to Ooyala any more, even though all requests still go through fine. This patch makes the module recognize that a 400 "error" is okay, since all it's really intended to do is check that the network connection is working.